Rectal Bleeding During Menstruation: What You Need to Know - Obstetrics and Gynecology

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Blood in the stool?


Hello doctor, I have my period these days, but I noticed blood on my stool (I have constipation).
Is this normal? I'm only 13 years old; I can't have colon cancer, right?

Xiao Yu, 10~19 year old female. Ask Date: 2017/09/02

Dr. Huang Jianzhong reply Obstetrics and Gynecology


During menstruation, if you notice blood on your stool (and you are experiencing constipation), is this normal? Answer: Noticing blood on your stool is usually indicative of hemorrhoids (either internal or external).

Reply Date: 2017/09/02

More Info


Rectal bleeding during menstruation can be concerning, especially for a young individual like yourself. It's important to understand that while some bleeding may occur due to various reasons, it is not typically considered normal to see blood in your stool, especially if you are experiencing constipation.
First, let's address the potential causes of rectal bleeding during your menstrual period. One common reason for blood in the stool during menstruation is related to hormonal changes. The menstrual cycle can affect the gastrointestinal system, leading to increased sensitivity and changes in bowel habits. Some individuals may experience constipation or diarrhea during their period, which can sometimes lead to minor rectal bleeding, especially if there is straining involved during bowel movements.

However, if you are experiencing constipation, it is crucial to manage it properly. Straining to have a bowel movement can cause small tears in the rectal area, known as anal fissures, which can lead to bleeding. Additionally, if you are constipated, hard stools can irritate the lining of the rectum, causing discomfort and bleeding.

At 13 years old, the likelihood of having colorectal cancer is extremely low. Colorectal cancer is rare in adolescents, and your age is a significant factor that reduces this risk. However, it is essential to monitor your symptoms closely. If the bleeding persists, increases in volume, or is accompanied by other symptoms such as severe abdominal pain, changes in bowel habits, or weight loss, it is crucial to seek medical attention.

Here are some recommendations to help manage your symptoms and promote better bowel health:
1. Increase Fiber Intake: Eating a diet rich in fruits, vegetables, whole grains, and legumes can help soften your stool and promote regular bowel movements. Aim for at least 25 grams of fiber per day.

2. Stay Hydrated: Drinking plenty of water is essential for preventing constipation. Aim for at least 8-10 glasses of water a day, especially if you are increasing your fiber intake.

3. Regular Physical Activity: Engaging in regular exercise can help stimulate bowel movements and reduce constipation. Aim for at least 30 minutes of moderate exercise most days of the week.

4. Avoid Straining: When you feel the urge to go, try to respond promptly. Straining can lead to fissures and worsen bleeding.

5. Consult a Healthcare Provider: If you continue to experience rectal bleeding or if you have concerns about your symptoms, it is essential to speak with a healthcare provider. They can perform a thorough evaluation, including a physical examination and possibly recommend further tests if necessary.

In summary, while rectal bleeding during menstruation can be alarming, it is often related to hormonal changes or constipation. By managing your diet, hydration, and physical activity, you can help alleviate constipation and reduce the risk of bleeding. However, do not hesitate to seek medical advice if your symptoms persist or worsen. Your health and well-being are important, and a healthcare professional can provide you with the best guidance tailored to your situation.

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