Pregnancy at 21 Weeks: Concerns About Abdominal Pain and Blood in Stool - Surgery

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I am 21 weeks pregnant?


Hello doctor, I have been experiencing pain on the left side of my abdomen for a month.
Today, when I went to the bathroom, I noticed blood in my stool, which was quite frightening.
Could this be colon cancer? Also, if I am pregnant, can I undergo a colonoscopy?

Fan Shi Yuan, 30~39 year old female. Ask Date: 2019/07/23

Dr. Ke Fangxu reply Surgery


This phenomenon may not necessarily indicate colon cancer; constipation combined with straining during bowel movements can also present in this way.
Generally, colonoscopy is not recommended during pregnancy because the procedure may exert pressure on the uterus.
It is advisable to first increase your intake of dietary fiber and stay well-hydrated.
During the summer, hemorrhoidal bleeding is often due to insufficient fluid intake.
If this issue persists after childbirth, then undergoing a colonoscopy can be considered at that time.

Reply Date: 2019/07/23

More Info


It's understandable to feel anxious when experiencing abdominal pain and blood in your stool during pregnancy. At 21 weeks, your body is undergoing significant changes, and while some discomfort can be normal, the presence of blood in your stool is a symptom that should not be ignored.

First and foremost, it's essential to differentiate between the types of abdominal pain you are experiencing. Mild cramping and discomfort can be common during pregnancy due to the stretching of ligaments and the growing uterus. However, persistent pain, especially if it is severe or localized, warrants further investigation. The fact that you have been experiencing pain on the left side for a month is concerning and should be evaluated by a healthcare professional.

The presence of blood in your stool can have various causes, ranging from benign to serious conditions. Some possible explanations include:
1. Hemorrhoids: These are swollen veins in the rectal area that can cause bleeding, especially during bowel movements. Hemorrhoids are common during pregnancy due to increased pressure on the pelvic veins.

2. Anal fissures: Small tears in the lining of the anus can occur, often due to constipation or straining during bowel movements, leading to bleeding.

3. Gastrointestinal issues: Conditions such as diverticulitis, inflammatory bowel disease (IBD), or infections can also cause abdominal pain and rectal bleeding.

4. Serious conditions: While less common, conditions like colorectal cancer can present with these symptoms, especially if there is a family history or other risk factors.

Regarding your question about undergoing a colonoscopy while pregnant, it is generally considered safe to perform this procedure during pregnancy, but it is usually reserved for cases where the benefits outweigh the risks. Your healthcare provider will assess your symptoms, medical history, and the potential need for a colonoscopy. They may recommend other diagnostic tests, such as a stool test or imaging studies, to evaluate your condition further.

Given your symptoms, it is crucial to seek medical attention promptly. A healthcare provider can perform a physical examination, possibly order imaging studies, and recommend appropriate treatment based on the findings. They may also refer you to a gastroenterologist if necessary.

In the meantime, here are some general recommendations to manage your symptoms:
- Stay hydrated: Drink plenty of fluids to help prevent constipation, which can exacerbate hemorrhoids and anal fissures.

- Dietary adjustments: Incorporate high-fiber foods into your diet, such as fruits, vegetables, and whole grains, to promote regular bowel movements.

- Avoid straining: When using the restroom, try to relax and avoid straining, as this can worsen hemorrhoids and lead to fissures.

- Rest: If you are experiencing significant discomfort, ensure you are getting adequate rest and avoiding activities that may exacerbate your symptoms.

In conclusion, while some abdominal pain and discomfort can be normal during pregnancy, the presence of blood in your stool is a symptom that requires immediate medical evaluation. Please reach out to your healthcare provider as soon as possible to discuss your symptoms and determine the best course of action. Your health and the health of your baby are of utmost importance, and timely intervention can help address any potential issues.

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