Soaking through protection every hour or two, bleeding past a week, clots the size of a quarter: these are signs worth evaluating, not enduring. Here's how to tell what's normal, what isn't, and what an evaluation actually involves.
Your period is likely too heavy if you bleed through one or more pads or tampons every one to two hours, bleed longer than seven days, or pass clots larger than a quarter. Feeling dizzy, weak, or unusually tired during or after your period matters too, since heavy bleeding can cause anemia. Any of these signs deserves a gynecologic evaluation.
A menstrual cycle is counted from the first day of one period to the first day of the next. For most adults, a normal cycle runs between 21 and 35 days, and a normal period lasts up to 7 days, with the heaviest flow in the first few days. There's real variation from woman to woman; what's steady and predictable for you is your own baseline.
Doctors use the term abnormal uterine bleeding (AUB) for bleeding that falls outside those bounds: bleeding or spotting between periods or after sex, heavy bleeding, periods longer than 7 days, cycles outside the 21-to-35-day range or varying wildly month to month, and any bleeding after menopause. A meaningful change from your own normal, even inside the "official" ranges, is also worth mentioning to your gynecologist.
Source: American College of Obstetricians and Gynecologists (ACOG), Abnormal Uterine Bleeding
Heavy menstrual bleeding is more common than most women realize, affecting roughly one in five American women each year, and many assume their flow is normal because it's all they've known. The practical warning signs: bleeding through one or more pads or tampons every one to two hours, periods lasting longer than seven or eight days, and passing clots larger than a quarter. Small clots on your heaviest days, by contrast, are common and usually not concerning.
The impact test matters as much as the numbers: if your period regularly forces you to plan your life around bathroom access, double up on protection, cancel work or plans, or wake to change protection overnight, that's a level of bleeding worth investigating, not accommodating.
Heavy or irregular bleeding is a symptom, not a diagnosis, and no single condition explains it. Problems with ovulation are a frequent cause: when ovulation is skipped, the uterine lining can build up and shed heavily and unpredictably. That's common in perimenopause and in conditions like PMOS (formerly known as PCOS) and hypothyroidism. Structural causes include fibroids and polyps, both usually noncancerous, and adenomyosis, where the uterine lining grows into the muscle wall, typically causing heavy, painful periods.
Other causes deserve equal attention: bleeding disorders such as von Willebrand disease, a frequent culprit when periods have been heavy since adolescence; medications, including blood thinners and the copper IUD, and breakthrough bleeding with hormonal contraception; pregnancy-related causes, including miscarriage and ectopic pregnancy; pelvic infection; and thickening or precancerous change of the uterine lining. Less commonly, abnormal bleeding is an early sign of endometrial cancer, which is most often diagnosed at an early, treatable stage. Sometimes more than one cause is present at once, which is exactly why the answer is an evaluation rather than an assumption.
Source: ACOG, Abnormal Uterine Bleeding
Month after month of heavy blood loss can outpace the body's ability to rebuild iron stores, leading to iron-deficiency anemia. The symptoms creep in gradually: fatigue that rest doesn't fix, weakness, shortness of breath with ordinary activity, dizziness, or a run-down feeling that's easy to blame on a busy life. Many women discover their bleeding was abnormal only after a blood test explains their exhaustion.
A complete blood count is a routine part of evaluating heavy periods, and treatment works on both fronts at once: replacing iron, and treating the bleeding so the anemia doesn't simply return.
Source: ACOG, Abnormal Uterine Bleeding
The workup starts with your story: your personal and family health history, medications, birth control method, and the pattern of your bleeding. Tracking your bleeding for a few weeks before your visit, on a calendar or a period-tracking app, genuinely helps. From there, evaluation typically includes a physical and pelvic exam and targeted testing: a pregnancy test when relevant, a complete blood count to check for anemia, thyroid or bleeding-disorder testing when the history suggests it, and usually a pelvic ultrasound to look for fibroids, polyps, and lining changes.
Depending on your age, history, and ultrasound findings, some women also need a closer look at the uterine lining, through saline-enhanced ultrasound, hysteroscopy, or an endometrial biopsy, particularly when bleeding patterns raise the question of lining overgrowth. Treatment then follows the cause: medications are usually tried first, including hormonal options, tranexamic acid, and anti-inflammatories, with procedures reserved for specific situations. At Sparrow, evaluation and treatment for heavy and irregular periods, including in-office ultrasound, is provided by Dr. Megan Luciano, a board-certified gynecologist in Winter Garden, Florida.
Source: ACOG, Abnormal Uterine Bleeding
Schedule a routine evaluation for periods that have gradually become heavier, longer, or less predictable, or for symptoms of iron deficiency like persistent fatigue. Be seen promptly for bleeding between periods or after sex, for heavy bleeding with worsening dizziness or weakness, and, without exception, for any bleeding after menopause.
Seek emergency care if you are soaking through pads or tampons every hour for more than two hours in a row and also have chest pain, shortness of breath, or feel lightheaded or dizzy. Bleeding at that pace is acute abnormal uterine bleeding, and it needs urgent medical attention rather than waiting for an appointment, especially if there's any chance you're pregnant.
Source: ACOG, Abnormal Uterine Bleeding
Any of these signs is a reason to bring your periods up with a gynecologist, even if you've lived with them for years.
The goal is an actual answer: the cause identified, treated, and followed until your cycles and your energy are back where they should be.
Schedule your first visit with Dr. Luciano today — unhurried appointments, direct answers, and care built around you from day one.
We intentionally maintain an unhurried schedule so every patient receives the time and attention she deserves.