What is heavy menstrual bleeding?
Heavy menstrual bleeding, or menorrhagia, is a common condition where your period produces an unusually excessive blood flow, lasts longer than seven days, or both. Losing a significant amount of blood during your cycle can make leaving home feel stressful, especially if you’re worrying about leaks or needing a bathroom nearby. It can also lead to health concerns like iron-deficiency anemia over time.
Primary care providers and gynecologists are usually the first to evaluate heavy menstrual bleeding and recommend treatment based on its cause. If a hematologic condition is suspected, Penn Medicine’s specialized bleeding disorders team provides advanced testing and care, partnering closely with your primary physicians to build a personalized treatment plan.
Signs you may have abnormally heavy menstrual bleeding
It isn’t always easy to tell whether your period is heavier than normal, especially if it’s the only experience you’ve had. If your period regularly disrupts your daily routine or you’re concerned about how much you’re bleeding, talk with your care provider.
Key symptoms of heavy menstrual bleeding include:
- Soaking through pads or tampons: Needing to change a pad or tampon every hour or two for several hours in a row.
- Doubling up on protection: Wearing more than one pad or using a pad and a tampon together to prevent leaks.
- Waking up to change protection: Having to get up during the night to change a pad or tampon.
- Bleeding for more than a week: Having a period that lasts longer than seven days.
- Passing large blood clots: Finding jelly-like clumps that are about the size of a quarter or larger.
- Feeling unusually tired: Experiencing fatigue, weakness, dizziness, or shortness of breath, which may be signs you’re losing too much blood during your period.
What causes heavy menstrual bleeding?
Excessive bleeding during your regular menstrual period can happen for many reasons, ranging from hormonal changes to bleeding disorders to conditions affecting the uterus or other parts of the body. In some cases, no specific cause is found.
Bleeding between periods, after sex, during pregnancy, or after menopause is considered abnormal uterine bleeding and should be evaluated by your care provider.
Your menstrual cycle depends on a balance of hormones, including estrogen and progesterone. When that balance changes, the lining of the uterus can build up and shed as heavier bleeding. Not releasing an egg during your monthly cycle (anovulation) can also trigger heavier blood flow.
Hormone-related causes include:
- Polyendocrine metabolic ovarian syndrome (PMOS)
- Obesity
- Thyroid disorders like hyperthyroidism
Physical changes to the uterus or its lining can lead to longer or heavier periods. Conditions in the uterus include:
- Uterine fibroids
- Cervical polyps
- Adenomyosis
Sometimes heavy menstrual bleeding points to a systemic medical issue elsewhere in the body. Genetic bleeding disorders, like von Willebrand disease, keep blood from clotting normally. Kidney disease, liver disease, and reproductive infections like pelvic inflammatory disease can also cause unusually heavy periods.
Endometriosis is a separate condition that's often confused with heavy menstrual bleeding. It typically causes pelvic pain and painful periods and, in some cases, can also produce heavy menstrual flow. The two conditions can sometimes occur together.
Certain medications and birth control options can alter your menstrual flow. Examples include nonhormonal intrauterine devices (IUDs), blood-thinning medications, and some hormonal treatments.
How heavy menstrual bleeding is diagnosed
Your provider will start by asking about your menstrual cycle, symptoms, overall health, medications, and family history. From there, they may perform a pelvic exam and order blood tests to check for anemia, thyroid conditions, or blood-clotting issues. Imaging tests can also help evaluate the uterine lining and fallopian tubes for physical changes.
If initial testing doesn’t reveal a clear cause, a hematologist can evaluate you for underlying bleeding disorders, which may include genetic testing for inherited conditions.
Treatment for heavy menstrual bleeding
Treatment depends on what’s causing your heavy bleeding, how severe it is, your overall health, and whether you’d like to become pregnant in the future.
Managing heavy periods focuses on easing blood flow, correcting iron deficiency or anemia, and addressing what’s behind your symptoms. Many people find relief with nonsurgical options, including iron supplements, nonhormonal medications to control bleeding, or hormone therapy to regulate menstrual cycles and lighten periods.
If noninvasive options don’t provide enough relief, your care team may recommend a procedure to address the underlying cause. Depending on your diagnosis, minimally invasive or uterine-sparing approaches can remove or shrink abnormal tissue, ease your symptoms, or treat conditions like uterine fibroids. When appropriate, surgery may also be an option for menorrhagia treatment.
Expert, connected care for complex heavy periods
Excessive menstrual bleeding isn’t always caused by a gynecologic condition, though that’s often what care teams evaluate first. For some people, it can be a sign of an underlying bleeding disorder. Pinpointing the source of heavy flow can be complex, which is why our gynecologists work alongside hematologists, minimally invasive gynecologic surgeons, and reproductive specialists to evaluate complex cases and deliver tailored care.
If testing reveals an inherited or acquired bleeding disorder like von Willebrand disease, our blood disorder experts provide ongoing management while keeping your entire care team connected. Whatever's behind your symptoms, choosing Penn Medicine means having a compassionate, world-class team by your side to help you find answers.