Menstrual Blood Color Changes: What You Need to Know - Obstetrics and Gynecology

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Menstrual issues


Hello Doctor: I always notice that on the first day of my menstrual period, the color of the menstrual blood seems to be darker.
Although the color on the toilet paper is not very dark red, the second day it turns bright red.
Since my period is not long, lasting about three to four days, it gradually becomes dark red.
When I see a pool of blood in the toilet, is that considered a blood clot? I had an ultrasound examination within the month, and the results were normal.
Is there anything specific I should pay attention to regarding this situation?

Nìmíng, 20~29 year old female. Ask Date: 2017/08/08

Dr. Cao Guotao reply Obstetrics and Gynecology


Hello, that should be considered normal.
If you still feel unwell, I recommend seeing a gynecologist.
Wishing you good health.

Reply Date: 2017/08/08

More Info


Understanding the color changes in menstrual blood can be quite informative and is often a topic of concern for many women. Menstrual blood color can vary significantly throughout the menstrual cycle, and these changes can be influenced by several factors, including the age of the blood, hormonal fluctuations, and the presence of blood clots.

Firstly, it is essential to understand that menstrual blood is not just blood; it also contains uterine lining tissue, mucus, and other fluids. The color of menstrual blood can range from bright red to dark brown or even black, and each color can indicate different things about your menstrual health.

1. Bright Red Blood: This typically indicates fresh blood, which is often seen at the beginning of your period. Bright red blood suggests that the blood is flowing quickly and has not had much time to oxidize. This is usually a normal finding.

2. Dark Red or Brown Blood: As your period progresses, the blood may become darker. This darker color is often due to the blood being older and having had more time to oxidize. It is common to see dark red or brown blood towards the end of your period, as the flow slows down and the blood takes longer to exit the body.

3. Blood Clots: It is not uncommon to notice small clots in your menstrual blood, especially on heavier flow days. These clots can appear as dark red or brown and are typically made up of blood and tissue. Small clots (about the size of a quarter or smaller) are generally considered normal. However, if you notice larger clots or if the clots are accompanied by heavy bleeding or severe pain, it may be worth consulting a healthcare provider.

4. Duration of Menstrual Flow: A typical menstrual period lasts between 3 to 7 days. If your period is consistently shorter or longer than this, or if you experience significant changes in your cycle, it may be a good idea to seek medical advice.

5. Other Considerations: Since you mentioned that you had an ultrasound that returned normal results, this is reassuring. However, if you experience any of the following symptoms, you should consult a healthcare professional:
- Heavy bleeding that soaks through one or more pads or tampons every hour for several consecutive hours.

- Severe pain that is not relieved by over-the-counter pain medications.

- Periods that last longer than 7 days.

- Any sudden changes in your menstrual cycle, such as irregular periods or unexpected bleeding between periods.

In summary, the changes in menstrual blood color are typically normal and can reflect the age of the blood and the flow rate. Bright red blood at the beginning of your period is normal, while darker blood towards the end is also common. The presence of small clots can be typical, but larger clots or significant changes in your menstrual pattern should be evaluated by a healthcare provider. Keeping track of your menstrual cycle and any accompanying symptoms can help you and your doctor better understand your menstrual health.

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