What Does Big Blood Clots in Period Mean? Heavy Bleeding

It is normal to pass blood clots occasionally during menstruation; however, frequently passing large blood clots could be a sign of any underlying issue.

When you pass blood clots during your periods occasionally, it is normal. Many women pass blood clots on the second or third day of their periods.

However, if the bleeding is very heavy during all days of the period, you may pass frequent clots, which may be a cause for concern.

Menorrhagia means menstrual bleeding that is more (heavier) than usual.

If you change your tampon every two hours or sooner If you pass blood clots larger than the size of a quarter on any day of the period If your periods last more than seven daysIf your cycle is less than 21 days If you need to change pads or tampons in the middle of the night

Many conditions may affect your menstrual cycle, making them heavier and prone to passing clots.

6 reasons why you may be passing big blood clots


  • Stress Any type of stress (physical or emotional) can cause the release of stress hormones in the body. This can cause hormonal imbalance that may lead to heavier bleeding and clots.
  • Thyroid disorders If you suffer from an over-functioning (hyperthyroidism) or under-functioning (hypothyroidism) thyroid gland, it can affect the hormones that regulate your period. This may impact the flow and severity of your menstrual cycle. The thyroid is a butterfly-shaped gland located in the front of your neck.The thyroid imbalances may be caused by various conditions, including stress, autoimmune disorders, iodine or selenium-deficient diet, drugs, or tumors.If your doctor suspects that you suffer from a thyroid condition, they will do a physical examination, run a thyroid panel to estimate TSH, T3, and T4 along with antithyroid antibody levels in your blood. This may or may not be followed by thyroid sonography.
  • Uterine fibroids Uterine fibroids grow inside the uterus and its lining can cause a heavier period than normal. Similarly, small growths called the uterine polyps that grow along with the cervix, or the lining of the uterus can cause heavy bleeding and blood clots in your menstrual flow. The uterine fibroids are often diagnosed using sonography, uterine computed tomography scan, and laparoscopic procedures.
  • Birth control Many types of birth control, especially intrauterine contraceptive devices (IUCD) inserted inside the uterus can cause you to experience heavier bleeding or clots during periods. This may happen up to a year after the IUCD was inserted.
  • Medications Many drugs can cause clots and heavier periods. Medications, such as blood thinners, anticoagulants (Warfarin, clopidogrel, aspirin), contribute to abnormal menstrual flow and bleeding. Sometimes, they may cause clots.
  • A missed abortion An undetected miscarriage early in the pregnancy can often be confused for a large clot.The pregnancy test may or may not be positive before the period starts. It may be accompanied by abdominal cramps and general malaise (feeling of being unwell). Read More

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