12/02/2026
Health tips
Blood clots during a period are generally caused by the body's natural coagulation process, where blood, tissue from the uterine lining, and proteins mix when flow is heavy. They usually occur during the first few days of menstruation when bleeding is heaviest, causing blood to accumulate in the uterus and clot.
Key Causes and Factors:
Heavy Menstrual Flow (Menorrhagia): When bleeding is rapid or excessive, the body's natural anticoagulants cannot keep up, resulting in clots.
Uterine Fibroids: Noncancerous growths in the uterus, which can increase menstrual flow and, consequently, clotting.
Endometriosis/Adenomyosis: Conditions where uterine tissue grows outside or within the muscle wall, causing heavy, painful periods.
Hormonal Imbalances: Fluctuations in estrogen and progesterone can cause the uterine lining to thicken and shed irregularly.
Miscarriage or Other Conditions: Large, frequent clots can sometimes indicate a miscarriage or other underlying bleeding disorders.
When to See a Doctor:
Clots are larger than a quarter.
You are soaking through pads or tampons every 1โ2 hours.
You experience severe, intense pain or cramping.
While small, occasional clots are normal, frequent large clots should be evaluated by a healthcare professional to identify underlying conditions like uterine fibroids, hormonal imbalances, or endometriosis.