The main causes of external hemorrhoids are constipation or excessive abdominal pressure, bad habits, connective tissue proliferation, etc. The specific analysis is as follows: 1. constipation or excessive abdominal pressure: when the patient exerts stool or excessive abdominal pressure, the perianal blood vessels rupture, blood accumulation leads to pain in the perianal mass, which can form thrombosed external hemorrhoids. 2. bad habits: sedentary, squatting can lead to continuous high pressure in the anal canal affecting the perianal blood return to form external hemorrhoids. 3. Drinking alcohol: excessive alcohol consumption may directly stimulate the perianal veins so that the hemorrhoidal venous plexus is congested and dilated, inducing the formation of external hemorrhoids. 4. connective tissue hyperplasia: by external forces long-term friction perianal skin, or inflammatory stimulation and other factors, so that the anal margin skin hyperplasia, edema, the formation of connective tissue external hemorrhoids. The main performance of external hemorrhoids is perianal pain, itching, foreign body sensation, swelling, etc., usually rarely cause bleeding, pain may be obvious thrombosed external hemorrhoids. In addition, the diet should pay attention to dietary fiber, light and easy to digest food, avoid spicy and stimulating food, drink more water, keep the bowel movement. If the symptoms are serious and cannot be relieved, surgery is recommended.