Greenish Discharge from the Anus: Causes and Concerns - Surgery

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The sudden presence of light green discharge from the anus can be indicative of several conditions. It may suggest an infection, such as a sexually transmitted infection (STI) or a gastrointestinal issue, such as a parasitic infection or an inflammatory condition. It is important to consult a healthcare professional for a proper diagnosis and appropriate treatment?


Hello Doctor: About two to three weeks ago, I noticed pain in my anus when using the restroom.
While showering, I felt a lump near the front part of the perineum, which was painful when pressed.
The entire left side of my anus also hurt.
At the same time, I noticed a moist sensation that would appear after half a day, and when I wiped with toilet paper, I saw a light green discharge that had no noticeable odor.
After a few days, the lump disappeared, leaving a small point of discomfort, but I still have a discharge, although it is less than before.
Occasionally, when I wipe after using the restroom, I notice a slight trace of blood, but this is infrequent.
The main issue is the sudden appearance of a sticky discharge.
I am unsure of the cause, as I have seen suggestions that it could be hemorrhoids, a fistula, or a sexually transmitted infection.
Currently, there is no pain, and I would like to know if it will heal on its own or if there is a problem that requires seeing a doctor.
Is surgery a possibility?

Yifeng, 30~39 year old female. Ask Date: 2024/04/14

Dr. Zhang Shuhao reply Surgery


Based on your description, it could be an anal abscess or a fistula.
During inflammation, there may be a localized pus-filled cavity, which, when ruptured, will discharge purulent material.
Once it drains completely, the pain may alleviate.
If there is persistent discharge, it is advisable to seek medical evaluation to check for a fistula, which may require surgical intervention.

Reply Date: 2024/04/14

More Info


Greenish discharge from the anus can be concerning, and it’s important to understand the potential causes and implications. Based on your description, several factors could be at play, including hemorrhoids, anal fissures, or possibly an infection.
Firstly, hemorrhoids are swollen veins in the lower rectum and anus that can cause pain, discomfort, and sometimes bleeding. They can also lead to mucus discharge, which may appear greenish if mixed with other bodily fluids. The fact that you experienced pain and swelling in the area suggests that hemorrhoids could be a possibility, especially if you have a history of constipation or straining during bowel movements.

Another potential cause is an anal fissure, which is a small tear in the lining of the anus. This can occur due to passing hard stools or straining, and it can lead to pain, bleeding, and sometimes a discharge. The greenish color of the discharge could be due to the presence of mucus, which is often produced in response to irritation or inflammation in the anal area.

Infections, such as sexually transmitted infections (STIs) or bacterial infections, can also lead to unusual discharge. If the discharge is accompanied by other symptoms like itching, burning, or a foul odor, this could indicate an infection that requires medical attention.
Given that you mentioned the discharge is intermittent and that the pain has subsided, it’s possible that the condition may resolve on its own. However, the presence of any blood, even if infrequent, is a sign that you should seek medical evaluation. Blood in the stool or during wiping can indicate a more serious condition, and it’s always best to err on the side of caution.

It’s also important to consider the possibility of a fistula, which is an abnormal connection between the anal canal and the skin. This can occur after an abscess or infection and can lead to persistent discharge. If you have had any previous infections or abscesses in the anal area, this could be a concern.

In terms of treatment, if the issue is due to hemorrhoids or fissures, conservative measures such as increasing fiber intake, staying hydrated, and using topical treatments may help alleviate symptoms. However, if the condition does not improve or worsens, or if you experience significant pain, persistent bleeding, or changes in bowel habits, it is crucial to consult a healthcare professional.
A doctor may perform a physical examination and possibly recommend further tests, such as a colonoscopy, to rule out any serious underlying conditions. Surgical intervention may be necessary in cases of severe hemorrhoids, fissures that do not heal, or if a fistula is present.

In summary, while there is a possibility that your symptoms may resolve on their own, it is advisable to seek medical attention, especially given the presence of blood and the ongoing discharge. A healthcare provider can offer a proper diagnosis and treatment plan tailored to your specific situation. Remember, it’s always better to be proactive about your health, particularly when it comes to symptoms involving the gastrointestinal tract.

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