What causes pain inside the buttocks?

Pain inside the buttocks can be caused by various factors, mainly including the following: 1. **Anal Fissure**: This typically occurs during or after bowel movements, possibly accompanied by bleeding and constipation. The pain is often episodic, burning, or sharp (like a knife-stab), lasting for several minutes, mostly caused by irritation from fecal matter. 2. **Anal Sinusitis**: Characterized by mild aching or a feeling of heaviness in the buttocks. Pain may worsen during bowel movements due to pressure on the inflamed anal sinus from fecal matter. It is often accompanied by small amounts of purulent or mucous discharge. 3. **Perianal Abscess**: Mainly presents with a feeling of distension and pain. When pus forms, the pain becomes severe, often described as pecking-like (similar to a chicken pecking). It may involve subcutaneous perianal abscess, ischiorectal fossa abscess, etc. 4. **Hemorrhoids**: Caused by congestion and swelling of veins in the anal canal or lower rectum. Pain and bleeding are common symptoms. 5. **Unhealthy Habits**: For example, prolonged sitting may lead to poor circulation in the buttocks, causing pain. If discomfort occurs, it is recommended to seek timely medical attention for targeted treatment.