Blood Clots During Menstruation: Causes and Concerns - Obstetrics and Gynecology

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Presence of blood clots during menstruation?


Hello doctor, for the past two to three years, I have consistently experienced the passage of blood clots on the third day of my menstrual period, with the size of the clots being similar to that of a small thumb.
Could you please tell me what might be the cause of this, or is this considered normal?

J, 20~29 year old female. Ask Date: 2016/02/26

Dr. Cao Guotao reply Obstetrics and Gynecology


Hello, if there are blood clots in your menstrual period, it is recommended to see a gynecologist for an ultrasound examination.
Wishing you good health.

Reply Date: 2016/02/26

More Info


Understanding blood clots during menstruation can be a common concern for many women. It’s important to recognize that menstrual blood can vary significantly in consistency and appearance, and the presence of blood clots is not uncommon. However, certain factors can help determine whether the occurrence of blood clots is normal or if it warrants further investigation.

Firstly, menstrual blood is composed of blood, uterine lining (endometrial tissue), and mucus. During menstruation, the uterus sheds its lining, and this process can lead to the formation of clots. Blood clots during menstruation can vary in size, and while small clots are generally considered normal, larger clots—like the size of a small thumb—may raise questions.

Several factors can contribute to the formation of blood clots during menstruation:
1. Hormonal Imbalances: Hormones play a crucial role in regulating the menstrual cycle. An imbalance in estrogen and progesterone can lead to heavier menstrual bleeding and the formation of clots. Conditions such as polycystic ovary syndrome (PCOS) or thyroid disorders can disrupt hormonal balance.

2. Uterine Fibroids or Polyps: These are non-cancerous growths in the uterus that can cause heavier bleeding and clotting. Fibroids can vary in size and may lead to more significant blood loss during menstruation.

3. Endometriosis: This condition occurs when tissue similar to the uterine lining grows outside the uterus. It can cause painful periods and heavy bleeding, often accompanied by clots.

4. Pelvic Inflammatory Disease (PID): An infection of the reproductive organs can lead to inflammation and abnormal bleeding, potentially resulting in clots.

5. Blood Disorders: Conditions that affect blood clotting, such as von Willebrand disease or thrombophilia, can lead to abnormal clotting during menstruation.

6. Age and Menstrual Cycle Changes: As women approach menopause, hormonal fluctuations can lead to changes in menstrual flow, including heavier bleeding and clot formation.

In your case, since you have been experiencing blood clots consistently on the third day of your period for the past two to three years, it may be worth consulting a healthcare professional. While occasional small clots can be normal, persistent larger clots may indicate an underlying issue that could benefit from further evaluation.

It’s also essential to consider other symptoms you may be experiencing, such as:
- Severe menstrual cramps
- Changes in the regularity or duration of your periods
- Unusual bleeding between periods
- Symptoms of anemia (fatigue, weakness, pale skin)
If you notice any of these symptoms, it’s advisable to seek medical advice. A healthcare provider may recommend tests such as blood work, ultrasounds, or pelvic exams to determine the cause of your symptoms and to rule out any serious conditions.

In summary, while the presence of blood clots during menstruation can be normal, especially if they are small and infrequent, larger clots or changes in your menstrual pattern should be discussed with a healthcare professional. They can provide personalized advice and treatment options based on your specific situation, ensuring your menstrual health is appropriately managed.

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