Causes of swelling on one side of the buttocks

Swelling and pain on one side of the buttocks generally refers to pain at the anus, which may be caused by constipation, hemorrhoids, or perianal abscess. This type of pain is mainly caused by anal diseases, and common ones include anal fissure, anal sinusitis, thrombosed external hemorrhoids, and rectal cancer. These causes can cause swollen and painful buttocks.

What causes swelling on one side of the buttocks?

1. Anal fissure

The pain caused is regular and often occurs during or after defecation, mainly caused by irritation from feces and enlargement of ulcer fissures. The pain is a burning or stabbing pain that can last for several minutes; the pain is relieved after the excrement is discharged. In addition, due to the irritation of stool, the internal expansion may be persistent spasm, causing severe and long-lasting pain in the ulcer rupture; it usually lasts for several hours, and the patient is restless and very painful; in severe cases, the pain may last for more than 24 hours. In addition to pain, anal fissures are often accompanied by symptoms such as bleeding and constipation.

2. Anal sinusitis

Generally, there is slight pain and heaviness in the buttocks. When defecating, the excrement is likely to compress the inflamed anal sinus and cause burning pain at the anus. If the muscles atrophy due to excessive tension, the pain will worsen and radiate to the buttocks and the back of the thigh. It is often accompanied by a small amount of pus or mucous secretion with a foul odor. Over time, it can cause discomfort such as dampness, coldness, and itching around the anus.

3. Thrombosed external hemorrhoids

In mild cases, there is discomfort, but most cases are accompanied by swelling and pain. Because the veins around the anus are damaged, blood clots coagulate to form venous thrombosis, and dark blue, ring-shaped, hard lumps appear under the epidermis of the anus, usually at 3 or 9 o'clock in the lithotomy position.

4. Perianal abscess

The main symptom is distending pain, and when pus forms, the pain is like a chicken pecking at the skin. Because of the differences in the location of perianal abscess, cyst size, pathogens, patient's body resistance and many other factors, the symptoms and clinical symptoms are also different. Common ones include subcutaneous abscess of the anus, sciatic duodenal cyst, pelvic duodenal cyst, retroduodenal cyst, and tuberculous cyst. Doctors at Quanzhou Boshi Anorectal Hospital emphasized that in addition to different clinical symptoms, this type of cyst generally has fever, chills, constipation, and difficulty urinating. Unlike other locations, more than 90% of perianal abscesses can cause anal fistulas, and the history of the disease is relatively long.

5. External hemorrhoid edema

The main symptoms are heaviness and burning pain, and the main manifestation is a localized lump at the edge of the anus, which is hard, smooth, crystal clear, and causes obvious dull pain. It is mostly caused by fatigue, straining during defecation or surgical stimulation.