Chronic Conditions

Why Is My Menstrual Period So Heavy?

Heavy menstrual bleeding

Overview
Some women have menstrual bleeding that is heavy or lasts for more than a few days. This condition used to be called menorrhagia. Heavy menstrual bleeding is a common concern. But most women don’t have enough blood loss for it to be called heavy menstrual bleeding.
Some women have menstrual bleeding between periods, or earlier or later in their cycles than expected. This type of bleeding is called abnormal uterine bleeding or irregular menstrual bleeding.
Heavy menstrual bleeding, blood flow, and cramping make it harder to do your usual activities. If you dread your period because you have heavy menstrual bleeding, talk with your doctor. Many treatments can help.

Symptoms

Symptoms of heavy menstrual bleeding may include:

  • Soaking through one or more sanitary pads or tampons every hour for several hours in a row.
  • Needing double sanitary protection to control your menstrual flow.
  • Getting up at night to change sanitary pads or tampons.
  • Bleeding for more than a week.
  • Passing blood clots larger than a quarter.
  • Limiting daily activities due to heavy menstrual flow.
  • Feeling tired, fatigued, or short of breath as the result of blood loss.

When to see a doctor

Seek medical help before your next scheduled exam if you have:

  • Vaginal bleeding is so heavy it soaks at least one pad or tampon an hour for more than two hours in a row.
  • Bleeding between periods or unusual vaginal bleeding.
  • Vaginal bleeding after menopause.

Causes

Fibroid locations

There are three major types of uterine fibroids. Intramural fibroids grow within the muscular uterine wall. Submucosal fibroids bulge into the uterine cavity. Subserosal fibroids project to the outside of the uterus. Some submucosal or subserosal fibroids may be pedunculated. This means they hang from a stalk inside or outside the uterus.

Uterine polyps

Uterine polyps attach to the uterus by a large base or a thin stalk. They can grow to be several centimeters in size. Uterine polyps can cause irregular menstrual bleeding, bleeding after menopause, very heavy menstrual flow, or bleeding between periods.

Adenomyosis

With adenomyosis, the same type of tissue that lines the uterus is present within the muscles that make up the walls of the uterus. It also can grow from the surface of the uterus into the walls of the uterus. This tissue also is known as endometrial tissue.

In some cases, the reason for heavy menstrual bleeding is unknown. However several conditions may cause heavy menstrual bleeding. They include:

  • Hormones are out of balance. In a typical menstrual cycle, there’s a balance between the hormones estrogen and progesterone. This controls the buildup of the lining of the uterus. The lining of the uterus also is known as the endometrium. This lining is shed during a menstrual period. When hormones are out of balance, the lining becomes too thick and sheds by way of heavy menstrual bleeding or unexpected bleeding between periods. Several conditions can cause hormone imbalances. These include obesity, insulin resistance, thyroid problems, and polycystic ovary syndrome, which also is called PCOS.
  • Problems with the ovaries. Sometimes ovaries don’t release an egg during a menstrual cycle. This also is known as anovulation. When this happens, the body doesn’t make the hormone progesterone the way it usually does during a menstrual cycle. This leads to hormone imbalance and may result in heavy menstrual bleeding or unexpected bleeding between periods.
  • Uterine fibroids. These tumors develop during the childbearing years. They are benign, which means they are not cancerous. Uterine fibroids may cause heavier than normal menstrual bleeding or bleeding that goes on for a long time.
  • Polyps. These small growths on the lining of the uterus may cause menstrual bleeding that is heavy or lasts for a long time. They may cause bleeding between periods. Polyps also can cause spotting or bleeding after menopause. The growths are not cancerous.
  • Adenomyosis. In this condition, glands from the lining of the uterus grow into the wall of the uterus itself. This can cause heavy bleeding and painful periods.
  • Intrauterine device, also called an IUD. Heavy menstrual bleeding is a well-known side effect of using a hormone-free IUD for birth control. Talk to your doctor about other birth control options. IUDs with progestin may ease heavy menstrual bleeding.
  • Pregnancy complications. A single, heavy, late period may be due to a miscarriage. Another cause of heavy bleeding during pregnancy includes the unusual location of the placenta, which supplies nutrition to the baby and removes waste. The placenta may be too low or covering the opening of the uterus, which is called the cervix. This condition also is known as placenta previa.
  • Cancer. Cancer of the uterus or cervix can cause abnormal uterine bleeding, and unexpected or heavy menstrual bleeding. These cancers can happen before or after menopause. Women who have had an abnormal Pap test in the past are at higher risk of cervical cancer.
  • Genetic bleeding disorders. Some bleeding disorders that run in families cause heavy menstrual bleeding. These include von Willebrand’s disease, a condition in which the blood does not clot properly.
  • Medicines. Some medicines can result in heavy or lengthy menstrual bleeding. These include hormonal medicines such as birth control pills that have estrogen and progestin. These medicines typically help lessen menstrual bleeding but sometimes cause unexpected bleeding between periods. Medicines that prevent blood clots also may cause heavy menstrual bleeding. They include warfarin (Jantoven), enoxaparin (Lovenox), apixaban (Eliquis), and rivaroxaban (Xarelto).
  • Other medical conditions. Several other medical conditions may cause heavy menstrual bleeding. They include liver, kidney, and thyroid disease.

Risk factors

Risk factors vary with age and the medical conditions you have. Usually, the release of an egg from the ovaries signals the body to make progesterone. Progesterone is the hormone most responsible for keeping periods regular. If no egg is released, the body does not make enough progesterone. This can result in heavy menstrual bleeding or unexpected bleeding between periods.

In teenagers, an irregular period or heavy menstrual bleeding often happens when an egg is not released during a monthly cycle. Teenagers are most likely to have cycles without an egg release during the first year after they have their first period.

In older women of reproductive age, heavy menstrual bleeding is often caused by problems with the uterus. These include fibroids, polyps, and adenomyosis. But other problems also could cause heavy menstrual bleeding. Examples include cancer of the uterus, bleeding disorders, side effects of medicines, and liver or kidney disease.

Complications

Menstrual bleeding that is too heavy or lasts too long can lead to other medical conditions. These include:

  • Anemia. Heavy menstrual bleeding can cause anemia related to blood loss. Anemia is a condition in which the body lacks enough red blood cells to carry oxygen to tissues. The number of red blood cells is measured by hemoglobin. Hemoglobin is a protein in red blood cells that carries oxygen to tissues throughout the body. Iron deficiency anemia occurs as the body tries to make up for lost red blood cells. The body uses iron stores to make more hemoglobin so that enough oxygen can be carried to tissues. Heavy menstrual bleeding may make iron levels too low. This may result in iron deficiency anemia. Symptoms include headaches and feeling tired. Although diet plays a role in iron deficiency anemia, the problem is made worse by heavy menstrual periods.
  • Severe pain. Along with heavy menstrual bleeding, you might have painful menstrual cramps. This also is known as dysmenorrhea. Talk to your doctor if your cramps make it hard to do your daily activities.

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