A heavy period — medically called menorrhagia — usually happens because of hormone imbalances, uterine fibroids, adenomyosis, polyps, bleeding disorders, or certain medications, and while it's common, losing more than 80 ml of blood per cycle or soaking through a pad or tampon every hour signals something your body needs you to address.
If you're dealing with flooding, clots the size of a quarter or larger, or periods that drag on past seven days, you're not imagining it. Around one in five women experiences abnormally heavy menstrual bleeding at some point, and the causes range from easily fixable hormonal shifts to conditions that need medical treatment. This article breaks down the most common reasons your period might be heavier than normal in 2026, how to tell when it's time to see a doctor, and what you can actually do about it.
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A period is considered heavy when you lose more than 80 ml (about 5 tablespoons) of blood per cycle, need to change protection every hour or more frequently, pass clots larger than a quarter, or bleed for longer than seven days.
Most people have no idea how much blood they actually lose during menstruation — and that's understandable, since measuring it isn't exactly practical. The average period releases 30–40 ml of blood over three to five days. Heavy bleeding can reach 60–80 ml or more, and severe cases exceed 100 ml.
Here are practical signs that your flow qualifies as heavy:
If any of these sound familiar, something is causing your uterus to shed more lining than typical — and figuring out what that is determines the fix.
Yes — an imbalance between estrogen and progesterone is the single most common reason for heavy periods, especially during puberty, perimenopause, or after stopping hormonal birth control.
Your menstrual cycle depends on estrogen and progesterone working in balance. Estrogen builds up the uterine lining each month. Progesterone stabilizes it and triggers the controlled shedding you experience as your period. When progesterone is too low relative to estrogen — a state called estrogen dominance — the lining grows thicker than it should, resulting in heavier, longer bleeding when it finally sheds.
This imbalance commonly occurs during:
"Anovulatory cycles — cycles where no egg is released — lead to unopposed estrogen stimulation of the endometrium, which can cause heavy or prolonged bleeding." — Dr. Malcolm Munro, Professor of Obstetrics and Gynecology at UCLA
Fibroids — noncancerous growths in the uterine wall — are a leading cause of heavy periods, especially submucosal fibroids that grow into the uterine cavity and increase the surface area that bleeds.
Up to 80% of women develop fibroids by age 50, though not all cause symptoms. When they do, heavy menstrual bleeding is the most common complaint. Fibroids can range from the size of a seed to the size of a grapefruit, and their location matters more than their size when it comes to bleeding.
Submucosal fibroids (those bulging into the uterine lining) cause the most bleeding because they physically expand the area that sheds during menstruation. Intramural fibroids (within the muscle wall) can also increase flow if they're large enough to distort the cavity.
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Adenomyosis occurs when the tissue that normally lines the uterus grows into the muscular wall, causing the uterus to enlarge and bleed heavily during periods.
Think of adenomyosis as the uterine lining invading territory where it doesn't belong. The misplaced tissue still responds to monthly hormones, swelling and bleeding within the muscle wall. This leads to a boggy, enlarged uterus that sheds more heavily and painfully.
Adenomyosis is most common in women over 35, especially those who have had children or uterine surgery. It often coexists with fibroids, making diagnosis tricky without imaging.
Symptoms include:
Yes — endometrial polyps are soft growths attached to the uterine lining that can cause heavy bleeding, irregular spotting, and bleeding between periods.
Polyps are usually benign, but they act like extra surface area inside your uterus. They can bleed on their own schedule and contribute to heavier-than-normal periods. Polyps are most common after age 40 but can occur at any reproductive age.
Unlike fibroids, polyps are often easy to remove during a quick outpatient procedure called hysteroscopy. If your heavy bleeding started suddenly or you're also spotting between periods, polyps are worth investigating.
Underlying bleeding disorders like von Willebrand disease affect up to 1 in 100 women and can cause heavy menstrual bleeding that's often dismissed as "just a heavy period."
Von Willebrand disease (VWD) is the most common inherited bleeding disorder, and heavy periods are frequently the first — and sometimes only — symptom women notice. Other signs include easy bruising, prolonged bleeding from cuts, and bleeding gums.
"Up to 20% of women with heavy menstrual bleeding have an underlying bleeding disorder, most commonly von Willebrand disease." — American College of Obstetricians and Gynecologists
If you've had heavy periods since your very first cycle, bruise easily, or have a family history of bleeding problems, ask your doctor about testing.
Copper IUDs (like Paragard) commonly increase menstrual bleeding by 20–50%, especially in the first year — while hormonal IUDs typically reduce flow significantly.
The copper IUD is highly effective birth control, but heavier, crampier periods are a well-documented side effect. Copper causes a local inflammatory response in the uterus that increases bleeding. Most people adjust within 3–6 months, though some never do.
Hormonal IUDs like Mirena, Liletta, and Kyleena work the opposite way — they thin the uterine lining and often make periods lighter or stop them entirely. If you're on a copper IUD and struggling with flooding, switching to a hormonal option may solve the problem.
Blood thinners, aspirin, and some anti-inflammatory medications can increase menstrual flow by interfering with your blood's ability to clot.
Medications that affect heavy bleeding include:
| Medication Type | Examples | How It Affects Flow |
|---|---|---|
| Blood thinners | Warfarin, heparin, Eliquis | Prevents clotting, prolongs bleeding |
| Antiplatelet drugs | Aspirin, Plavix | Reduces platelet clumping |
| NSAIDs (high doses) | Ibuprofen, naproxen | Can thin blood with prolonged use |
| Some antidepressants | SSRIs like Prozac, Zoloft | May affect platelet function |
If your periods became heavier after starting a new medication, mention it to your doctor. There may be alternatives that don't affect your cycle.
Hypothyroidism (an underactive thyroid) disrupts the hormonal signals that control your cycle and commonly causes heavy, prolonged, or irregular periods.
Your thyroid gland influences nearly every system in your body, including your reproductive hormones. When thyroid function is low, estrogen metabolism slows down and progesterone production drops — the same imbalance that causes heavy bleeding from other hormonal causes.
Other signs of hypothyroidism include fatigue, weight gain, cold intolerance, dry skin, and hair loss. A simple blood test (TSH and free T4) can diagnose it, and treatment with thyroid hormone replacement typically normalizes periods within a few months.
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See a doctor if you're soaking through a pad or tampon every hour for several consecutive hours, passing clots larger than a golf ball, feeling faint or extremely tired, or if heavy bleeding is new and sudden.
Heavy periods aren't just inconvenient — they can cause iron-deficiency anemia, leaving you exhausted, pale, short of breath, and unable to concentrate. Chronic blood loss also affects your heart, which has to work harder to compensate.
Seek medical evaluation if you experience:
Your doctor will likely start with a blood count to check for anemia, hormone tests, and possibly an ultrasound to look for fibroids, polyps, or adenomyosis.
Diagnosis typically involves a pelvic exam, blood tests, ultrasound, and sometimes a hysteroscopy or endometrial biopsy to identify structural or hormonal causes.
Here's what to expect:
| Test | What It Checks | Why It Matters |
|---|---|---|
| Complete blood count (CBC) | Hemoglobin, hematocrit | Detects anemia from blood loss |
| Thyroid panel | TSH, T4 | Rules out thyroid disorders |
| Hormone levels | Estrogen, progesterone, FSH | Identifies hormonal imbalances |
| Pelvic ultrasound | Uterine structure | Shows fibroids, polyps, adenomyosis |
| Saline sonohysterogram | Inner uterine cavity | Better view of polyps and submucosal fibroids |
| Hysteroscopy | Direct visualization inside uterus | Allows biopsy and removal of polyps |
| Coagulation studies | Clotting factors | Tests for bleeding disorders |
Don't be afraid to ask which tests your doctor recommends and why. Getting the right diagnosis is the only way to find treatment that actually works.
Treatment depends on the cause and can range from hormonal medications and NSAIDs to procedures like endometrial ablation or, in severe cases, hysterectomy.
For most people, treatment starts conservatively and escalates only if needed:
Medications:
- Hormonal birth control (pills, patch, ring, hormonal IUD) — thins the lining and regulates cycles
- Tranexamic acid — a non-hormonal medication taken during your period that reduces bleeding by 30–50%
- NSAIDs (ibuprofen, naproxen) — taken at the start of your period, reduces flow and cramps
- Iron supplements — replaces iron lost through heavy bleeding
Procedures:
- Hysteroscopic polypectomy or myomectomy — removes polyps or fibroids while preserving the uterus
- Endometrial ablation — destroys the uterine lining to reduce or stop periods (not for those who want future pregnancy)
- Uterine artery embolization — cuts blood supply to fibroids, shrinking them
- Hysterectomy — surgical removal of the uterus (definitive, but major surgery)
"For most women with heavy menstrual bleeding, effective treatment is available that does not require hysterectomy." — American College of Obstetricians and Gynecologists
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While waiting for diagnosis or as a supplement to medical treatment, tracking your cycle, managing symptoms, and preventing anemia can make heavy periods more bearable.
Track your bleeding in detail using an app or calendar. Note how many pads or tampons you use daily, the size of any clots, and how you feel. This information is invaluable for your doctor.
Manage symptoms during heavy days:
- Use overnight pads or period underwear for extra protection
- Sleep on a dark towel to reduce laundry stress
- Keep ibuprofen or naproxen on hand — taking it before your period starts can reduce flow
- Stay hydrated and eat iron-rich foods (red meat, spinach, beans, fortified cereals)
Consider supplements:
- Iron (ferrous sulfate is most common — take with vitamin C for better absorption)
- Vitamin C (supports iron absorption and blood vessel health)
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Heavy periods affect around 1 in 5 women and are most often caused by hormonal imbalances, fibroids, adenomyosis, polyps, bleeding disorders, copper IUDs, certain medications, or thyroid problems. If you're soaking through protection every hour, passing large clots, bleeding past seven days, or feeling exhausted and dizzy, see a doctor — effective treatments exist that don't necessarily require surgery, and chronic blood loss can lead to anemia that affects your entire quality of life.
A sudden change to heavy, clotty periods often signals a hormonal shift (common in perimenopause or after stopping birth control), a new fibroid or polyp, or the development of adenomyosis. Stress, significant weight changes, and new medications can also trigger heavier bleeding. If the change persists for more than two cycles, see your doctor for evaluation.
Stress can absolutely affect your menstrual cycle. High cortisol levels interfere with the hormones that regulate ovulation and the uterine lining, potentially leading to heavier or more irregular periods. Chronic stress may also worsen underlying conditions like PCOS that already cause heavy bleeding.
Heavier periods in your 40s are common due to perimenopause — the transition years before menopause when hormones become increasingly erratic. However, fibroids, adenomyosis, and polyps also become more prevalent with age. Any new heavy bleeding after 40 warrants a checkup to rule out structural causes and, rarely, precancerous changes.
Losing more than 80 ml (about 5–6 tablespoons) of blood per cycle is considered heavy menstrual bleeding. Practically, if you're soaking through a pad or tampon
Reviewed and Updated on April 16, 2026 by George Wright