Heavy Periods (Menorrhagia) Toolkit

Fibroids (leiomyomas) are non-cancerous growths of the uterine muscle and are the most common cause of heavy menstrual bleeding. By age 50, up to 70-80% of women develop fibroids, though many are asymptomatic. Fibroids cause heavy bleeding by increasing the surface area of the uterine lining, distorting the uterine cavity, interfering with the uterus's ability to contract and stop bleeding, and affecting local blood vessel regulation. Submucosal fibroids (those that grow into the uterine cavity) cause the heaviest bleeding even when small. Size ranges from a pea to a melon. Diagnosis is typically by ultrasound.

Adenomyosis occurs when the tissue that normally lines the uterus (endometrium) grows into the muscular wall of the uterus. This causes the uterus to enlarge, become boggy, and bleed heavily. It is increasingly recognized as a very common cause of heavy, painful periods, affecting an estimated 20-35% of women. Symptoms include progressively heavier periods, severe cramps, a feeling of fullness or pressure in the pelvis, and painful intercourse. Adenomyosis is often underdiagnosed because it requires MRI or skilled ultrasound for accurate identification. It frequently coexists with endometriosis and fibroids.

When ovulation does not occur (anovulatory cycles), progesterone is not produced. Without progesterone to stabilize and organize the endometrial lining, estrogen causes it to grow thicker and more fragile. When this unstable lining eventually sheds, bleeding is often heavier, more prolonged, and unpredictable. Anovulatory heavy bleeding is most common at the extremes of reproductive life (teens and perimenopause) but also occurs with PCOS, thyroid disorders, significant stress, and rapid weight changes. The pattern is often irregular timing combined with heavy flow when bleeding does occur.

Up to 20% of women with heavy menstrual bleeding have an underlying bleeding disorder, most commonly von Willebrand disease (VWD), which affects 1% of the general population. VWD impairs the blood's ability to clot effectively. Other bleeding disorders include platelet function defects and, rarely, clotting factor deficiencies. Clues that suggest a bleeding disorder: heavy periods since your very first period (menarche), easy bruising, prolonged bleeding after dental work or cuts, nosebleeds lasting 10+ minutes, family history of bleeding problems, or postpartum hemorrhage. These conditions are significantly underdiagnosed in women.

Endometrial polyps: Benign growths on the uterine lining that cause irregular or heavy bleeding. Diagnosed by ultrasound (especially saline infusion sonography) and removed via hysteroscopy. Thyroid disorders: Both hypothyroidism and hyperthyroidism can cause heavy periods. Copper IUD: Can increase menstrual flow by 20-50% in some users, especially in the first 3-6 months. Medications: Blood thinners (warfarin, aspirin), some antidepressants, and tamoxifen can all increase menstrual bleeding. Endometrial hyperplasia: Thickening of the uterine lining, often from prolonged unopposed estrogen. Requires evaluation to rule out precancerous changes.

Tranexamic acid (TXA) is a non-hormonal medication that reduces menstrual blood loss by 30-55%. It works by stabilizing blood clots in the uterine lining, preventing the premature breakdown that causes heavy bleeding. Taken only during heavy flow days (typically 1-1.3g three times daily for up to 5 days), it acts quickly and is well-tolerated. It is available by prescription in most countries (over-the-counter in some). It can be combined with NSAIDs for additional flow reduction and pain relief. TXA does not affect your hormones, cycle regularity, or fertility.

NSAIDs (ibuprofen, naproxen, mefenamic acid) reduce menstrual blood loss by 20-40% in addition to their pain-relieving effects. They work by inhibiting prostaglandin synthesis, which reduces both uterine contractions and blood flow. Mefenamic acid (Ponstan) has the best evidence specifically for flow reduction. Take throughout the heavy flow days on a scheduled basis, not just as needed for pain. Starting 1-2 days before expected heavy bleeding is ideal. NSAIDs and tranexamic acid can be used together safely for even greater flow reduction (up to 60-70% combined).

The levonorgestrel-releasing IUD (Mirena, Liletta) is considered the most effective medical treatment for heavy menstrual bleeding, reducing blood loss by 71-96%. It thins the endometrial lining locally with minimal systemic hormonal effects. By 12 months, about 50% of users have very light periods and 20% stop bleeding entirely. It is as effective as endometrial ablation for HMB, lasts 5-8 years, and preserves fertility. It is the first-line treatment recommended by NICE, ACOG, and WHO for heavy menstrual bleeding. It also treats adenomyosis-related bleeding effectively.

Combined oral contraceptive pills: Reduce menstrual blood loss by about 40-50%. Continuous use (skipping placebos) can further reduce bleeding frequency. Norethisterone/progestins: Taken cyclically (days 5-26) to regulate and reduce bleeding. Useful when estrogen-containing methods are contraindicated. Depo-Provera injection: Often causes amenorrhea (no periods) within 12 months. Good for those who want long-acting, hassle-free management. GnRH agonists: Temporarily suppress ovarian function — used short-term to shrink fibroids before surgery or as a bridge treatment.

If heavy periods have depleted your iron, replenishment is critical. Oral iron: Ferrous sulfate (325mg = 65mg elemental iron), ferrous bisglycinate (better tolerated), or iron polysaccharide complex. Take on an empty stomach with vitamin C to enhance absorption. Every-other-day dosing is now shown to be as effective as daily with fewer GI side effects. Allow 3-6 months to fully replenish stores. IV iron: Recommended when oral iron is not tolerated, ferritin is very low (<15), or rapid repletion is needed. A single infusion can restore stores in 1-2 weeks. Diet: Heme iron (red meat, liver, oysters) is absorbed 2-3x better than non-heme (spinach, lentils, fortified cereals). Pair non-heme iron with vitamin C. Avoid calcium, coffee, and tea with iron-rich meals.

Menstrual cups (high capacity): Standard cups hold 25-30mL — 3-6x more than a tampon. High-capacity cups (Merula XL, Super Jennie) hold up to 42mL. Empty every 4-8 hours depending on flow. Menstrual discs: Sit higher and can hold 50-70mL. Auto-dump feature means they can last longer. Period underwear (heavy flow): Brands like Thinx Heavy, Modibodi Heavy-Overnight, or Knix Super hold 8-10 tampons' worth. Best as backup with cups/discs or for overnight. Overnight pads (super): Longest and most absorbent disposable option. Combination approach: For heaviest days, cup + period underwear provides maximum protection and confidence.

If you present to the ER with acute heavy menstrual bleeding, you can expect: vital signs check (blood pressure, heart rate — looking for signs of hypovolemia), blood tests (CBC to check hemoglobin/hematocrit, blood type and crossmatch if transfusion may be needed), IV fluids for stabilization, high-dose IV tranexamic acid or oral tranexamic acid, possibly high-dose hormonal therapy to stop active bleeding (combined OCP or IV conjugated estrogen), and evaluation for the underlying cause. If hemoglobin is very low (below 7 g/dL with symptoms), blood transfusion may be needed. You should be offered follow-up with gynecology for ongoing management after stabilization.

A thorough evaluation for heavy menstrual bleeding should include: Blood tests: CBC (hemoglobin, hematocrit, platelets), ferritin, TSH (thyroid), coagulation screen (PT, PTT), von Willebrand panel if history suggests bleeding disorder. Imaging: Transvaginal ultrasound (first-line) to assess for fibroids, polyps, adenomyosis, and endometrial thickness. Saline infusion sonography (SIS) or hysteroscopy if polyps or submucosal fibroids are suspected. MRI for complex fibroids or adenomyosis characterization. Endometrial biopsy: Recommended for women over 45, or younger women with risk factors (obesity, anovulation, tamoxifen use) to rule out hyperplasia or cancer.

When medical management fails or is inappropriate: Polypectomy: Hysteroscopic removal of endometrial polyps — often day surgery with quick recovery. Myomectomy: Surgical removal of fibroids while preserving the uterus. Can be hysteroscopic (for submucosal), laparoscopic, or open depending on size and number. Endometrial ablation: Destroys the uterine lining to reduce or stop bleeding. Not for those wanting future pregnancy. 80-90% success rate. Uterine artery embolization: Cuts blood supply to fibroids, causing them to shrink. Minimally invasive alternative to surgery. Hysterectomy: Definitive treatment. Considered when other options have failed, fertility is not desired, and quality of life is severely impacted.

Accurate flow tracking transforms your doctor's ability to help you. For the most useful data: record every product change with time and saturation level (light/moderate/heavy), note clot sizes (compare to coins: dime, quarter, golf ball), photograph your products before disposal if comfortable (many doctors find visual data helpful), track total period duration, and note the heaviest day(s). If using a menstrual cup, record mL at each emptying. Use the PBAC scoring system described in the assessment tab. Even 2-3 months of detailed tracking gives your doctor dramatically more information than saying "my periods are heavy."