What causes thick clot blood when you are on your period?

Thick clot blood during menstruation can have several causes:

1. Increased Progesterone Levels: During the luteal phase of the menstrual cycle, progesterone levels rise. This hormone can slow down the rate at which the uterine lining breaks down and sheds, leading to thicker clots.

2. Uterine Fibroids: The presence of uterine fibroids, benign growths that develop in the muscular wall of the uterus, can disrupt the normal shedding of the uterine lining. This disruption can cause the formation of larger blood clots due to increased tissue shedding.

3. Heavy Menstrual Bleeding: If you experience heavy menstrual bleeding (menorrhagia), the volume of blood passing through the vagina may be greater, leading to the formation of larger clots. Heavy menstrual bleeding can have various causes, including hormonal imbalances, uterine abnormalities, or certain medical conditions.

4. Endometriosis: Endometriosis occurs when endometrial tissue grows outside the uterine cavity, often on other pelvic organs. During menstruation, this displaced endometrial tissue sheds along with the uterine lining, resulting in potentially heavier bleeding and larger clots.

5. Adenomyosis: In this condition, the endometrial tissue grows into the muscular wall of the uterus. The invasion of endometrial tissue into the uterine muscle can cause heavier bleeding and increased clot formation.

6. Pregnancy Complications: Some women experience heavier menstrual bleeding or the passage of clots during early pregnancy, especially in cases of threatened or incomplete miscarriage. If you suspect you may be pregnant and experience these symptoms, it's essential to consult a healthcare professional immediately.

If you notice a sudden change in your menstrual bleeding pattern, including the occurrence of large or unusual clots, it's advisable to schedule an appointment with your healthcare provider to determine the underlying cause and receive appropriate management or treatment.