Gynecologic Conditions
Heavy Periods: Causes of Heavy Menstrual Bleeding and Treatment
Heavy menstrual bleeding is a period heavy enough to get in the way of your life: soaking through a pad or tampon every hour for several hours, passing large clots, or bleeding for more than seven days. Common causes include fibroids, polyps, adenomyosis, hormone imbalances and bleeding disorders. Most cases can be treated with medicine, and there are procedures if medicine isn't enough.
Many people live with heavy periods for years because it's all they've ever known, or because their mom's periods were the same. Common doesn't mean you have to put up with it.
The self-check: is my period too heavy?
Measuring blood loss at home is nearly impossible, so clinicians focus on how your period affects you. According to the CDC and ACOG, it's heavy if you:
- Soak through one or more pads or tampons every hour for several hours in a row
- Double up, like wearing a tampon and a pad together
- Wake up at night to change protection
- Pass clots the size of a quarter or larger
- Bleed for more than seven days
- Plan your life around your period: skipping the gym, avoiding light-colored pants, scouting where the bathrooms are on your commute
- Feel tired, weak or short of breath during or after your period
If you nodded at two or more, it's worth an appointment.
The old medical term was "menorrhagia." Today clinicians usually say "heavy menstrual bleeding," which is one type of abnormal uterine bleeding.
What causes it
Something in the uterus
- Uterine fibroids: benign muscle growths, especially ones that bulge into the uterine cavity. See our fibroids guide.
- Adenomyosis: lining tissue growing into the uterine muscle, often with painful periods.
- Endometrial polyps: small growths of the uterine lining.
- Endometrial hyperplasia or cancer: less common, but more likely with age and certain risk factors.
Hormones and ovulation
When you don't ovulate regularly, the lining can build up and then shed heavily. That's common:
- In the first few years after periods start
- During perimenopause
- With PCOS or thyroid disease
A bleeding disorder
The CDC notes that bleeding disorders, most often von Willebrand disease, are an under-recognized cause of heavy periods. Clues:
- Heavy periods since your very first one
- Frequent or long nosebleeds
- Easy bruising
- Heavy bleeding after dental work, surgery or childbirth
- A family member with a bleeding disorder
Many people with von Willebrand disease go years without a diagnosis because everyone assumed their periods were "just heavy."
Medicines and devices
- Blood thinners (anticoagulants)
- Copper IUD, which can make periods heavier, especially in the first months
Pregnancy
A miscarriage or ectopic pregnancy can look like a heavy or late period. If there's any chance you could be pregnant, take a test.
Before your appointment: keep a two-cycle diary
This is the single most useful thing you can bring. For each period, jot down:
- How many days you bleed
- How often you change protection on your heaviest day, and what you use (regular tampon, super, overnight pad, cup)
- The size of any clots (coin comparisons work: dime, quarter, bigger)
- Nights you woke up to change
- Days you missed work or school
- Symptoms like fatigue, dizziness or a racing heart
Also mention any personal or family history of easy bruising, nosebleeds or heavy bleeding after surgery or childbirth.
What testing looks like
Your clinician will ask about your bleeding pattern and history and do a pelvic exam. Tests may include:
- Pregnancy test
- Complete blood count and iron studies
- Thyroid testing
- Tests for bleeding disorders, when your history suggests one
- Transvaginal ultrasound
- Endometrial biopsy, usually for people 45 and older or with risk factors
The transvaginal ultrasound uses a slim probe placed a few inches into the vagina. It's usually more uncomfortable than painful and takes 10 to 20 minutes. An endometrial biopsy is quicker but crampier; many people take ibuprofen beforehand, so ask whether that's OK for you.
Heavy bleeding over months can drain your iron and lead to anemia. If you've been craving ice or feel winded climbing subway stairs, mention it. Your clinician may check your levels and recommend treatment. More in our guide to heavy periods and anemia.
Treatment options compared
Treatment depends on the cause, your age, other health conditions and whether you want to get pregnant.
| Treatment | How it works | Good to know |
|---|---|---|
| NSAIDs (ibuprofen, naproxen) | Lower prostaglandins, reducing bleeding and cramps | Taken during your period; not for everyone |
| Tranexamic acid | Helps blood clot to reduce flow | Non-hormonal; taken only during your period |
| Combined birth control (pill, patch, ring) | Thins the lining and regulates cycles | Also prevents pregnancy |
| Progestin pills or shot | Thins the lining | May cause irregular spotting |
| Levonorgestrel (hormonal) IUD | Releases progestin directly into the uterus | Among the most effective medical options; lasts years |
| Endometrial ablation | Destroys the uterine lining | Only for people who are done having children |
| Hysteroscopic removal of polyps or fibroids | Removes the structural cause | Keeps the uterus |
| Hysterectomy | Removes the uterus | Permanently stops periods |
Your clinician will choose the right medicine and dose for you. If a bleeding disorder turns up, you may also see a hematologist. For a common procedure option, read about endometrial ablation.
Give a medicine a fair trial. Many need two or three cycles before you can judge them.
Getting through heavy days in the meantime
- Go high-capacity: overnight pads, period underwear or a menstrual cup, plus spares in your bag.
- Track your cycle so you can plan around your heaviest days.
- Eat iron-rich foods like beans, leafy greens, lean meats and fortified cereals. Ask your clinician before starting an iron supplement.
- Stay hydrated, especially on heavy days.
- Tell your clinician if you're missing work or school. It helps them understand how much this affects you.
When to see a doctor
Make an appointment with a gynecologist if:
- Your periods regularly last more than seven days
- You often soak a pad or tampon every hour or pass large clots
- Your period keeps you from work, school or activities
- You feel tired, short of breath or dizzy, or your heart races
- You've had heavy periods since your first period, or have other bleeding symptoms
- Your periods have suddenly become much heavier than usual
Get emergency care if you soak through a pad or tampon every hour for two hours or more and feel lightheaded or faint, or if you have heavy bleeding and could be pregnant.
Finding care in New York
Heavy periods are usually evaluated and treated by gynecologists and OB/GYNs, with hematology brought in when a bleeding disorder is suspected. Browse OB/GYNs in New York or use the provider search to find care in the five boroughs, Long Island or the Hudson Valley.
Frequently asked questions
How much bleeding is too much during a period?
Signs that bleeding is too heavy include soaking through a pad or tampon every hour for several hours in a row, needing to double up on protection, changing protection overnight, passing clots the size of a quarter or larger, or bleeding for more than seven days.
Are blood clots during a period normal?
Small clots can be normal, especially on heavy days. Clots the size of a quarter or larger, or frequent large clots, are a sign of heavy bleeding that should be checked.
Can heavy periods be a sign of a bleeding disorder?
Yes. Bleeding disorders such as von Willebrand disease are an under-recognized cause, especially when heavy periods started with your first period or you also get frequent nosebleeds, easy bruising or bleeding after dental work.
Can heavy periods be stopped without surgery?
Often, yes. Hormonal IUDs, birth control, tranexamic acid and NSAIDs reduce bleeding for many people. Procedures are usually considered when medicines don't work or aren't a good fit.
Sources
- ACOG — Heavy Menstrual Bleeding (Patient FAQ)
- ACOG — Management of Acute Abnormal Uterine Bleeding in Nonpregnant Reproductive-Aged Women (Committee Opinion 557)
- CDC — Heavy Menstrual Bleeding
- NIH, National Heart, Lung, and Blood Institute — Von Willebrand Disease
- MedlinePlus — Heavy menstrual bleeding
This article is for general education and is not medical advice. It does not replace an evaluation by a licensed clinician who knows your history. If you think you have a medical emergency, call 911.