NayaBisa

Tag: heavy periods

  • Period Blood Clots: What’s Normal and When to Ask

    Period Blood Clots: What’s Normal and When to Ask

    There is a moment in most cycles when what lands on the pad stops looking like a liquid and starts looking like something solid. Nobody explains it in advance, so it is easy to jump to the worst conclusion. Period blood clots are a normal part of a heavy flow, and the useful questions are how big they get and how often they appear. Knowing that turns a frightening sight into something you can measure.

    Key takeaways

    • Clots form when the flow is fast enough that the uterus cannot dissolve the fibrin mesh inside the blood.
    • Small clots on your heaviest days are common and are not a problem in themselves.
    • Period blood clots the size of a quarter or larger, more than once or twice a day, are one of the standard signs of heavy menstrual bleeding.
    • Heavy bleeding is worth investigating mainly because it can slowly drain your iron stores.
    • What feels like a very heavy period does not always match what gets measured, so track the details rather than the feeling.

    What period blood clots actually are

    Blood from a cut turns into a gel because fibrin forms a mesh through it. Menstrual blood usually does not, since the lining of the uterus is full of enzymes that dissolve that mesh as fast as it forms. When the flow is heavy, the dissolving system cannot keep up and some blood arrives already clotted.

    At the same time, the uterus is working to stop the bleeding. Platelets clump at the exposed vessels, fibrin is deposited, and the muscle of the womb contracts to squeeze those vessels shut. A 2026 review of menstrual haemostasis notes that the flow conditions at the tiny spiral arteries which bleed during a period have never been measured directly, so the balance is still described in models.

    One piece of this has been tested. Women with heavy bleeding do not break down clots faster in their bloodstream, which is why heavy periods are treated as a local problem in the endometrium rather than a clotting disorder.

    What a normal amount of clotting looks like

    The heaviest days are the ones that produce clots. NHS guidance describes a typical period as lasting 2 to 7 days, usually about 5, with the flow heaviest in the first 2 days and a total loss of roughly 20 to 90ml, or about 1 to 5 tablespoons.

    The size thresholds used by clinicians all point the same way. NHS guidance flags clots larger than about 2.5cm, the size of a 10p coin, as one sign of heavy periods. The American College of Obstetricians and Gynecologists describes menstrual flow with blood clots as big as a quarter or larger. Cleveland Clinic lists clots the size of a quarter or bigger more than once or twice as a sign of heavy menstrual bleeding.

    The size of your period blood clots is the detail worth noticing, more than their colour or texture. Smaller clots, appearing once or twice on your heaviest day, do not feature on any of those lists.

    When period blood clots are worth checking

    Period blood clots are a sign to act on when they come with a flow that disrupts your life. Any of these patterns is worth an appointment:

    • Soaking through a pad or tampon every hour for several hours in a row.
    • Needing a pad and a tampon together, or changing a pad every 1 to 2 hours.
    • Bleeding that lasts longer than 7 days, even when the period blood clots themselves are small.
    • Bleeding through to your clothes or bedding, or avoiding plans because of your period.

    Heavy bleeding is not rare. About one third of women seek treatment for it, and Cleveland Clinic puts the share of people who menstruate affected by it between 27% and 54%.

    What matters is the blood loss rather than the clotting itself. Losing more blood than your body replaces can drain your iron stores and lead to iron deficiency anaemia, which shows up as tiredness, shortness of breath and a faster heartbeat. Feeling weak and dizzy during your period is often the first visible sign of that iron dip. Avoiding exercise during your period is itself on the NHS list of signs, so putting your training on hold is a symptom rather than a solution.

    What can cause larger clots

    Most large clots are the visible end of a heavy flow. Fibroids, adenomyosis, endometriosis and polycystic ovary syndrome all appear on the standard lists, along with thyroid problems and, in the first year of use, the copper intrauterine device.

    Inherited bleeding disorders are the cause that gets missed most often. Von Willebrand disease and platelet function disorders can present as nothing more than heavy periods, and a 2026 study of 235 teenage girls treated for iron deficiency anaemia found that 40.9% screened positive for von Willebrand disease after their iron levels were corrected.

    Medicines can do it too, since blood thinners and aspirin increase menstrual bleeding. Heavy periods are also common in the years approaching menopause, when cycles become less predictable.

    A small number of cases have a more serious cause. NHS guidance notes that heavy periods can rarely be a sign of womb cancer, and ACOG lists ectopic pregnancy and miscarriage among the causes.

    Why “it looks like a lot” is not the same as a lot

    How alarming your period blood clots look and how much blood you actually lose do not line up as neatly as you would expect. In a 2025 study, 79 people who described their periods as heavy had their loss measured, and the median was 66ml, with only about a quarter passing the 120ml threshold that defines heavy bleeding. Pad counts told a similar story: the heavy group used a median of 21.5 pads per cycle but still overlapped with those whose measured loss was normal.

    That cuts both ways. Some people who dread their periods are bleeding inside the normal range, while others who think theirs are manageable lose more blood than they realise. A 2026 validation study found a photo-based method matched the laboratory standard closely enough to detect heavy bleeding with 100% sensitivity and 93.5% specificity.

    How to track period blood clots before your appointment

    It helps to bring numbers rather than adjectives. ACOG advises using a calendar or a period-tracking app to record several cycles before your visit, including the dates your period started, how long the bleeding lasted and whether the flow was light, medium or heavy. Cleveland Clinic adds the details that change what happens next: cramping, any bleeding between periods and any large clots you passed.

    Three things are worth logging: the largest clot you passed, measured against a coin, the number of pad or tampon changes on your heaviest day, and how many days the bleeding lasted. If you would rather not hand your cycle history to a company, a private tracker keeps the log on your phone, which is the same information your doctor needs. There is more on cycle symptoms in our Cycle and Fertility archive.

    When to see a doctor

    Book a routine appointment if your periods have been heavy for a while, if they interfere with work, exercise or sleep, if you have severe pain, or if you bleed between periods or after sex. Post-menopausal bleeding always needs checking, and so does bleeding that is heavier than anything you have had before.

    Seek urgent care rather than waiting if you are soaking through pads very quickly, if you feel faint, dizzy or breathless, or if you have severe pain that painkillers are not touching. If you are pregnant or might be, heavy bleeding with period blood clots should be assessed urgently.

    How Lail can help

    Lail is our own period tracker, built for exactly the kind of record a doctor asks for. It logs flow, symptoms, mood and weight, and keeps everything on your phone with no account and no cloud sync. Premium adds a PDF export you can take to an appointment, and the app is free to download with ads. Lail is on the Play Store, and you can see it with the rest of our apps on our products page.

    Frequently asked questions

    Are period blood clots normal?

    Period blood clots are common, especially on your heaviest days, and a small one now and then is not a medical problem. What makes them worth checking is size and repetition rather than their presence. Clots around the size of a quarter, arriving more than once or twice a day, count as a sign of heavy menstrual bleeding.

    How big is too big for a clot?

    NHS guidance draws the line at about 2.5cm, roughly the size of a 10p coin, and ACOG uses a quarter as its comparison. Period blood clots that reach that size several times a day are worth mentioning to a doctor. One small clot on day one is a different situation entirely.

    Can large clots mean a miscarriage?

    Clots can be passed during a miscarriage, and heavy bleeding in early pregnancy is a reason to seek care the same day. That does not make every clot a sign of pregnancy loss, since fibroids, adenomyosis and plain heavy flow explain most of them. If you might be pregnant, treat large clots with pain as urgent.

    Do clots mean I have a bleeding disorder?

    Usually not, but bleeding disorders are under-diagnosed and heavy periods are often their only visible sign. Von Willebrand disease is the most common inherited one, and it turns up more often when a bleeding history is combined with a record of menstrual loss. That is one reason the clot sizes you note down are useful rather than fussy.

    This article is educational only and is not medical advice. Cycle patterns vary widely, and only a qualified healthcare provider can assess your symptoms or decide whether you need tests.

    Featured image: “SABA damebind” by Geir Ove Andreassen / Anno Kvinnemuseet, CC BY-SA 4.0, via Wikimedia Commons (https://commons.wikimedia.org/w/index.php?curid=98467535).

    Sources

  • Exercises to Avoid During Your Period, and What to Do Instead

    Exercises to Avoid During Your Period, and What to Do Instead

    Day three, and the plan on your phone says heavy squats. Your body has filed a complaint. Training advice tends to swing between “push through it” and “stay in bed,” which leaves the boring middle unanswered. That middle is where the honest answer to which exercises to avoid during your period actually lives.

    Key takeaways

    • Periods are not a medical reason to stop training, and NHS guidance lists gentle movement such as walking, swimming, cycling and yoga among its pain-relief steps.
    • The exercises to avoid during your period are the ones that spike your own symptoms: max-effort lifts, high-impact jumping, and long sessions in the heat.
    • Heavy bleeding plus a hard training block is the combination most likely to drain your iron stores.
    • A period that disappears while you train hard is a signal to get checked, not a badge of discipline.
    • Stop mid-session if you feel faint, dizzy or flood through a pad in an hour, because those belong in a doctor’s office rather than a grit test.

    What the research says about training on your period

    Clinicians do not treat menstruation as a reason to stop moving. Cleveland Clinic notes that people who exercise tend to have less menstrual pain, and NHS period pain guidance names gentle exercise such as walking, swimming, cycling and yoga among its self-care steps. A 2024 Bayesian network meta-analysis of 33 randomised trials in BMJ Evidence-Based Medicine put exercise at roughly a three-point drop in pain intensity on a ten-point scale. The same review hedges, describing non-drug options as things that “may result in a reduction or slight reduction in pain intensity” and calling for larger trials.

    The research is friendly, but it describes averages rather than your Tuesday. What shifts across a period is tolerance, not permission. Cramping happens when prostaglandin makes the uterus contract, and levels are highest around the start of bleeding, which is when the same workout can feel twice as heavy. Cleveland Clinic estimates that about 60% of people who menstruate get mild cramps, while 5% to 15% report pain severe enough to interfere with daily activities.

    Exercises to avoid during your period

    There is no medical list of banned movements, so treat any confident version of one with suspicion. In practice, the exercises to avoid during your period are the ones that make your own symptoms worse, and for most people that means changing the dose instead of cancelling the session. Here is where the adjustments usually land.

    Max-effort lifting is the first thing to scale back. A one-rep-max deadlift or a session built on hard bracing asks for stamina and a steady core rhythm, and both are harder to hold on your heaviest days. High-impact work comes second: box jumps, sprint intervals and long downhill runs land hard when your pelvis already aches. Long sessions in the heat, hot yoga included, get rough fast when you are already lightheaded.

    Yoga inversions deserve their own note. The rule that going upside down sends menstrual blood the wrong way is studio folklore, and NHS guidance does not single out any pose as one to stop. If inversions feel fine they are fine, and if they make you dizzy, that is the whole reason to skip them.

    Anything a doctor has flagged outranks all of this. Endometriosis, a bleeding disorder, a history of anaemia or a heart condition each change the picture, and your clinician’s advice wins. Swimming is the classic case of an exercise people avoid for cultural reasons rather than medical ones, and NHS guidance names it as a way to ease period pain.

    Why heavy bleeding and hard training are a poor pairing

    Iron is where period training most often goes wrong. NHS says iron deficiency anaemia is usually caused by blood loss, and lists tiredness, shortness of breath, palpitations, pale skin and headaches among the signs. A 2018 review in the European Journal of Sport Science found that menstruating athletes, particularly those with heavy menstrual bleeding, carry a higher risk of iron deficiency. That matters twice in training, because iron carries the oxygen your muscles keep asking for.

    Heavy bleeding has a working definition, and it helps to know where you sit. NHS counts changing a pad or tampon every one to two hours, using two products at once, periods longer than seven days, or clots bigger than about 2.5cm. A study of 30 female varsity athletes in Applied Physiology, Nutrition, and Metabolism found 20% were iron deficient, and that a higher menstrual loss score went with lower ferritin. If your flow is heavy and your training block is heavy, ask for a ferritin test instead of guessing.

    Can training too much change your cycle?

    Yes, and this is the part of the question where the risk is real and well documented. NHS lists “doing too much exercise” among the common causes of missed or late periods, alongside sudden weight loss and stress. Sports medicine describes the same pattern through low energy availability: burn more than you take in for long enough and the hormonal signal driving your cycle weakens. A 2019 review in Sports Medicine sets out how that plays out across menstrual function and bone health, and notes there is no single energy threshold where it starts.

    The distinction that matters is sustained under-fuelling against one hard day. A brutal session on day two will not stop your period, but months of eating too little around hard training can. A 2026 narrative review in Frontiers in Sports and Active Living, drawing on 151 studies, describes menstrual dysfunction as a clinical barometer of energy deficiency and links it to weaker bone density over time. Missing periods has plenty of other causes, so treat it as a reason for a check-up rather than a self-diagnosis.

    What to do on the days you feel awful

    Scale intensity and keep the habit. A twenty-minute walk, an easy spin, a swim or a mobility session keeps your routine intact and often eases cramps. NHS self-care for period pain also covers a heat pad wrapped in a tea towel, a warm bath, and painkillers such as paracetamol or ibuprofen. If you need painkillers to get through training most months, book a GP appointment rather than buying another supplement.

    Move the hard sessions when your schedule allows. For a lot of people the first two days are the worst and things ease after that, so the heaviest lifting can wait a week or two. There is no rule that your training week has to look identical seven days out of seven.

    When to see a doctor

    Get urgent help if period pain is severe or worse than usual and painkillers have not touched it, or if you feel faint during or after training. Book a GP appointment if heavy periods are affecting your life, you bleed between periods, your periods run past seven days, or you have missed three in a row. Unusual breathlessness, palpitations and fatigue during exercise are worth mentioning too, since they can point to anaemia. None of that is a failure of effort.

    How Lail can help

    Tracking is the unglamorous half of this problem. Lail is a private period tracker for Android that keeps your data on your phone, with no account and no cloud sync. You can log flow, cramps, mood and weight, then look back at which days your training actually fell apart. That record does more at a GP appointment than a vague memory of a bad month, and you can install Lail from Google Play.

    This article is educational and is not medical advice. Talk to a qualified healthcare professional about your own symptoms and before changing how you train.

    Featured image: a woman holding a push-up position on a mat. Photo by homegets.com on Flickr, CC BY 2.0: https://www.flickr.com/photos/141436406@N04/49778014313

    FAQ

    Is it safe to lift weights on my period?

    For most people, yes. Strength training does not appear on any medical no-go list for menstruation. What changes is how much you can recover from, so save the one-rep-max attempts for a week when you feel less flat.

    Should I skip the gym on my heaviest day?

    Not automatically. If your flow is heavy and you feel drained, an easy session beats a hard one, but no medical rule says stay home. Adjust the plan instead of dropping the habit.

    Does exercise make period pain worse?

    The evidence points the other way. The 2024 network meta-analysis found exercise reduced pain intensity, and NHS lists gentle exercise among its self-care advice. If your experience differs, track it for two or three cycles before deciding.

    Which exercises to avoid during your period should I genuinely skip?

    Only the ones that make your symptoms worse on the day. The exercises to avoid during your period are the ones that spike pain, not a fixed list you have to memorise. Everything else stays optional.

    Can too much exercise stop your period?

    It can be one cause, and NHS lists it among the common reasons periods go missing. The mechanism is usually sustained low energy availability rather than the workout itself. If you have missed three periods in a row, see a GP.

    Sources

  • Weak and Dizzy During Your Period: How Iron and Spinach Help

    Weak and Dizzy During Your Period: How Iron and Spinach Help

    One morning you stand up from the sofa, the room tilts, and you hold the wall until it settles. Your legs feel heavy while your head feels oddly light. When that happens around your bleed, the reason is usually plain: menstrual blood carries iron out of your body, and if you lose more than you replace, you can end up feeling dizzy during your period. Spinach and other iron-rich foods help, but how you eat them matters as much as how much you eat.

    Key takeaways

    • Iron carries oxygen in your blood, so losing it through heavy bleeding can show up as tiredness, breathlessness and a floating, light-headed feeling.
    • Women aged 19 to 49 need about 14.8 mg of iron a day, more than men of the same age need.
    • Spinach supplies non-heme iron, the plant form your body absorbs less easily than the iron in meat, poultry and fish.
    • Vitamin C eaten with spinach helps absorption, while tea, coffee and dairy make iron harder to take in.
    • Dizziness that arrives with fainting, chest pain or breathlessness at rest is a reason to see a doctor.

    Why iron loss can make you dizzy during your period

    Iron is a building block of hemoglobin. That is the protein in red blood cells which carries oxygen from your lungs to the rest of your body. When iron runs low, hemoglobin falls with it, and every tissue gets a little less oxygen than it expects. The warning signs are easy to dismiss because they are vague: feeling flat, getting breathless on stairs, and a head that swims when you stand up quickly.

    Cleveland Clinic lists fatigue, headaches, muscle cramps, pale skin, a sore tongue and a fast heart rate among the symptoms of iron-deficiency anemia. It notes that the condition can also make you feel dizzy or lightheaded. The NHS points to tiredness and lack of energy, shortness of breath, noticeable heartbeats and paler than usual skin. Feeling dizzy during your period is often less a separate problem than the way low iron announces itself.

    What heavy bleeding actually looks like

    Menstrual bleeding is the most common way women lose iron. How much you lose varies enormously from person to person. The NHS counts a period as heavy if you need to change your pad or tampon every one to two hours, if a period lasts longer than seven days, or if you pass clots bigger than about 2.5 cm. Bleeding through to your clothes or bedding, and feeling tired or short of breath for much of the month, are also signs worth noting. If you want to judge that rather than guess at it, period blood clots explains what the size and the frequency of them actually tell you.

    Many people assume their flow is normal because it has always been that way. Heavy periods can be a problem in their own right. The NHS advises seeing a GP if they are affecting your daily life or have been heavy for some time. A blood test is usually the first step, and the NHS names heavy periods and pregnancy as very common causes of iron-deficiency anemia.

    How much iron you actually need

    The NHS puts the daily target at 14.8 mg of iron for women aged 19 to 49, dropping to 8.7 mg for women aged 50 and over. It also notes that women who lose a lot of blood during their periods may need iron supplements on top of food. Harvard’s Nutrition Source uses the US figures, 18 mg a day for women aged 19 to 50 and 27 mg during pregnancy, against just 8 mg for men. The gap comes down to one thing: menstruation removes iron from the body every month.

    There is a caution worth knowing before you buy a bottle. The NHS reports that high doses of iron supplements cause constipation, nausea, vomiting and stomach pain, and that very high doses can be dangerous, especially for children. It says 17 mg or less a day of supplement iron is unlikely to cause harm, while Harvard lists 45 mg as the daily upper limit for adults. Food first, supplements with medical advice, is the safer order of operations.

    Spinach, iron, and the absorption problem

    Spinach has a reputation as the iron vegetable, and it does contain iron. The catch is which kind. Harvard’s Nutrition Source explains that iron from food comes in two forms: heme iron, found only in meat, poultry and seafood, and non-heme iron, found in plant foods including spinach, lentils, beans and leafy greens. Heme iron is better absorbed by the body than non-heme iron, which is why a bowl of spinach does not deliver iron the way a steak does.

    How much of that iron you actually take in comes down to what you eat with it. Harvard notes that vitamin C eaten at the same meal improves the absorption of non-heme iron. A squeeze of lemon, some chopped tomato or a few slices of bell pepper alongside cooked spinach all work in your favor. The NHS treatment advice points the same way: it suggests drinking orange juice after an iron tablet, and lists tea, coffee, milk and dairy among the things that make iron harder to absorb.

    A few combinations that put this into practice:

    • Cooked spinach with lemon juice, tomato or sweet peppers for the vitamin C.
    • Lentils or beans with nuts and dried apricots in the same meal.
    • Fortified breakfast cereal eaten with fruit rather than a large glass of milk.
    • Tea and coffee sipped between meals instead of alongside them.

    Spinach still earns a place on the plate, even if it is not the heaviest hitter. The NHS list of good sources leans on red meat, liver, beans such as kidney beans, edamame and chickpeas, nuts, dried fruit, fortified cereals and soy bean flour. Treat spinach as one useful part of a wider iron-rich diet.

    When to talk to a healthcare provider

    An occasional light-headed moment when you stand up is common and usually harmless. It deserves a proper look when you often feel dizzy during your period, or when you also feel breathless or your heart races. Tiredness that stops improving with rest is another signal. The NHS advises seeing a GP if heavy periods are affecting your daily life, and a blood test can confirm whether low iron is behind your symptoms.

    Severe dizziness, fainting or chest pain needs urgent medical attention rather than a dietary experiment. If you are pregnant, iron deficiency is common, and it is worth raising early with your midwife or GP.

    How Lail can help

    Losing iron through your period is easier to spot when you know your own pattern. Lail is a private period companion that keeps your data on your phone, with no account and nothing uploaded to the cloud, and its Wawasan (Insights) section suggests food ideas that match your cycle phase. Log how heavy your flow really is and when the dizziness shows up, then bring those notes to your appointment. Download Lail from Google Play, visit lailapp.nayabisa.com, or browse our cycle and fertility guides.

    FAQ

    Does your period really make you dizzy?

    Yes, it can. Menstrual bleeding removes iron from your body, and when stores run low, hemoglobin drops and less oxygen reaches your brain and muscles. Cleveland Clinic lists dizziness and lightheadedness as symptoms of iron-deficiency anemia and names blood loss from your period as one of its causes. Feeling dizzy during your period is common enough to be worth checking rather than ignoring.

    Is spinach really a good source of iron?

    Spinach contains iron, but it is non-heme iron, the plant form your body absorbs less efficiently than the iron in meat (Harvard). Pair it with a vitamin C source such as lemon, tomato or peppers, and keep tea and coffee away from the meal. Spinach then becomes a useful part of an iron-rich diet rather than a fix on its own.

    How long does it take to correct low iron?

    The NHS says iron tablets are usually taken for about six months to rebuild your stores, not just until the tiredness lifts. How quickly you feel better depends on what caused the loss. Heavy periods need attention too. Only a clinician can confirm the diagnosis and the right dose, so avoid self-prescribing high-dose iron.

    Which foods contain the most iron?

    The NHS lists liver, red meat, beans such as kidney beans, edamame and chickpeas, nuts, dried fruit, fortified breakfast cereals and soy bean flour among the best sources. Harvard adds oysters, clams, mussels, sardines, beef and poultry on the heme side. Lentils, spinach, potato with skin and dark chocolate sit on the non-heme side. Iron from meat and seafood is absorbed more easily, which matters when your levels are already low.

    Disclaimer

    This article is educational and not medical advice. Iron needs, menstrual flow and symptoms vary from person to person. If you feel dizzy, unusually tired or breathless, or if your periods are heavy, speak to a qualified healthcare provider before starting any supplement.

    Sources