Anal Redness and Swelling After Diarrhea: When to Seek Help - Surgery

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Redness and swelling of the anus after diarrhea?


Hello, doctor.
A few days ago, I had food poisoning and experienced vomiting and diarrhea all night.
The next morning, although I didn't vomit or have diarrhea anymore, I noticed a red, swollen area around my anus that feels like a polyp and is painful when I move (there's no bleeding, and my stool doesn't have blood).
The pain was less the following day, but after having a bowel movement on the third day, the pain returned.
Should I see a specialist for hemorrhoids, or could this just be due to excessive wiping causing the redness and swelling? (I have a habit of wiping very thoroughly before rinsing with water.)

Ms. Chen, 20~29 year old female. Ask Date: 2018/03/27

Dr. Ke Fangxu reply Surgery


Based on your description, it seems more like the typical symptoms of an anal fissure, which include pain during bowel movements accompanied by slight bleeding.
The common causes are often constipation or diarrhea.
The fundamental treatment is to improve bowel habits, and warm sitz baths can also be beneficial.
You can also purchase hemorrhoid suppositories at the pharmacy for relief.
If the symptoms persist without improvement, it is advisable to consult a physician for further evaluation.

Reply Date: 2018/03/27

More Info


Experiencing anal redness and swelling after a bout of diarrhea can be concerning, and it’s important to understand the potential causes and when to seek medical attention. Based on your description, it seems that you have had a recent episode of gastrointestinal distress, which can lead to various complications in the anal area.

Firstly, the redness and swelling you are experiencing could be due to several factors. Diarrhea can cause irritation of the anal region due to frequent wiping and the acidic nature of loose stools. This irritation can lead to inflammation, resulting in redness and swelling. The fact that you mentioned a lump resembling a polyp could suggest a few possibilities, including hemorrhoids or an anal fissure. Hemorrhoids are swollen veins in the lower rectum and anus that can become inflamed and painful, especially after episodes of diarrhea or constipation. An anal fissure, on the other hand, is a small tear in the lining of the anus, which can also cause pain and discomfort, particularly during bowel movements.

Given that you mentioned the pain has decreased over time but recurs after bowel movements, it is possible that you are dealing with a mild case of hemorrhoids or an anal fissure. The absence of bleeding is a positive sign, as it may indicate that the condition is not severe. However, persistent pain, especially if it worsens or does not improve, warrants further evaluation.

Here are some recommendations on when to seek medical help:
1. Persistent Symptoms: If the redness and swelling do not improve within a few days, or if the pain worsens, it is advisable to consult a healthcare provider. They can perform a physical examination to determine the exact cause of your symptoms.

2. Severe Pain: If you experience severe pain that interferes with your daily activities, it is important to seek medical attention promptly.

3. Changes in Bowel Habits: If you notice any changes in your bowel habits, such as blood in your stool, significant changes in stool consistency, or prolonged diarrhea, you should see a doctor.

4. Signs of Infection: If you develop fever, chills, or any signs of infection (such as increased redness, warmth, or pus), you should seek immediate medical care.

5. History of Anal Issues: If you have a history of hemorrhoids or other anal conditions, it may be beneficial to see a specialist, such as a proctologist, for a thorough evaluation.

In the meantime, there are some self-care measures you can take to alleviate your symptoms:
- Gentle Cleaning: Continue to clean the area gently after bowel movements, but avoid excessive wiping. Consider using moist wipes or a bidet to minimize irritation.

- Warm Baths: Soaking in a warm bath can help soothe the area and reduce inflammation.

- Over-the-Counter Treatments: You may consider using over-the-counter topical treatments for hemorrhoids, which can provide relief from pain and swelling.

- Dietary Adjustments: Ensure you are consuming a high-fiber diet to prevent constipation, which can exacerbate hemorrhoids and anal fissures.

In conclusion, while your symptoms may be related to irritation from diarrhea, it is essential to monitor your condition closely. If the symptoms persist or worsen, seeking medical advice is the best course of action to rule out any serious underlying issues and to receive appropriate treatment.

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