Heavy Periods: Causes, Tests, and Treatment Options

You plan your days around your period. You wear a pad and a tampon together, set alarms to change them at night, and worry about leaks at work. You may feel tired all the time. Maybe you assumed this was just how your body works.

Heavy periods are common, but they are not something you have to live with. This guide explains how clinicians define heavy bleeding, what causes it, which tests they order, and the treatments that help.

What counts as heavy?

Heavy menstrual bleeding is one of the most common problems women report to their clinicians. The CDC estimates it affects about 1 in 5 women in the US each year.[1]

The CDC lists these signs:[1]

• Soaking through one or more pads or tampons every hour for several hours in a row.
• Needing to use two pads at once, or a pad and a tampon.
• Changing pads or tampons during the night.
• Periods that last more than 7 days.
• Blood clots the size of a quarter or larger.
• Bleeding that keeps you from your normal activities.
• Feeling tired, low in energy, or short of breath.

The UK NICE guideline defines heavy bleeding by its effect on your life: blood loss that interferes with your physical, social, emotional, or material quality of life.[2] You do not need to measure your blood loss to be taken seriously.

Common causes

Clinicians often use a system called PALM-COEIN to sort causes. It splits them into structural problems and other causes.[3]

Structural causes:

• Polyps: small growths in the lining of the uterus.
• Adenomyosis: lining tissue growing into the muscle wall of the uterus.
• Leiomyomas (fibroids): non-cancer muscle growths in the uterus.
• Malignancy or hyperplasia: cancer or precancer of the lining, which is less common and more likely after 40 or with risk factors.

Non-structural causes:

• Coagulopathy (bleeding disorders), such as von Willebrand disease.
• Ovulation problems, such as PCOS, thyroid problems, or the years before menopause.
• Problems with the lining itself.
• Iatrogenic causes, meaning from medicines or devices, such as blood thinners or a copper IUD.

For many people, no clear cause is found.[1] The CDC advises testing for a bleeding disorder if no other cause is found, especially if you have had heavy bleeding since your first period, bleeding after surgery or childbirth, frequent nosebleeds, or easy bruising.[1]

What your doctor looks at

History and exam

Your clinician will ask how long and how heavy your periods are, how they affect your life, whether you want to become pregnant, and whether you have signs of a bleeding disorder. A pelvic exam can find an enlarged uterus or other signs of fibroids.[2][3]

Tests

• A pregnancy test, when pregnancy is possible.
• A complete blood count (CBC) to check for anemia. NICE recommends this for everyone with heavy bleeding.[2] Many clinicians in Canada and the US also check ferritin, which shows iron stores.
• Thyroid tests only if you have signs of a thyroid problem.[2]
• Tests for bleeding disorders when your history suggests one.[1][2]
• A pelvic ultrasound, often transvaginal, when the exam suggests fibroids or another structural cause, or when treatment has not helped.[2]
• An endometrial biopsy (a small sample of the uterine lining) for people at higher risk of precancer or cancer. The SOGC guideline suggests a biopsy for people 40 and older, and for younger people with risk factors such as obesity, PCOS, or bleeding that does not respond to treatment.[3] ACOG uses an age of 45 as its main threshold, with the same attention to risk factors.

Treatment options

Treatment depends on the cause, your symptoms, and whether you want a pregnancy in the future.

Medicines

• Levonorgestrel IUD (hormonal IUD): NICE lists it as a first-line treatment when there is no large structural cause. It greatly reduces bleeding for most users and also prevents pregnancy.[2]
• Tranexamic acid: a non-hormonal tablet taken only during your period. It helps blood clot and reduces flow.[2][4]
• NSAIDs, such as ibuprofen or naproxen, taken during the period. They reduce both bleeding and cramps.[2]
• Combined hormonal birth control: pills, patches, or rings that make periods lighter and more regular.[3][4]
• Progestin pills or injections.
• Iron supplements to treat or prevent anemia.

Ask your clinician or pharmacist which options are safe with your health history.

Procedures

• Endometrial ablation: a procedure that destroys the lining of the uterus. It is for people who do not want future pregnancy.[2][4]
• Hysteroscopic removal of polyps or some fibroids.
• Uterine artery embolization or myomectomy (fibroid removal) for fibroids.
• Hysterectomy (removal of the uterus): a permanent option when other treatments do not help enough.[2]

Questions to ask your clinician

• Is my bleeding heavy enough to need tests or treatment?
• Do I have anemia or low iron?
• Could I have a bleeding disorder such as von Willebrand disease?
• Do I need an ultrasound or an endometrial biopsy?
• Which treatments fit my plans for pregnancy?
• What are the side effects of each option?
• If the first treatment does not work, what is the next step?

When to get care quickly

Call 911 or go to the emergency department if you:

• Soak through a pad or tampon every hour for 2 hours or more and feel dizzy or faint.
• Have chest pain, shortness of breath, or a racing heart.
• Have heavy bleeding and might be pregnant.
• Have heavy bleeding with severe belly pain or fever.

See a clinician soon for any bleeding after menopause, or bleeding between periods or after sex.

Bottom line

Heavy periods are common, and they are treatable. Clinicians look for structural causes, hormone problems, and bleeding disorders, and they check for anemia. Effective options range from the hormonal IUD and tranexamic acid to procedures, and the right choice depends on your goals.

Primary AI can show you the guideline and study sources behind this topic in plain language, so you can bring better questions to your appointment.