The main symptoms of anal muscle spasm are painless defecation difficulty, perianal pain spasm, rectal pain and other symptoms. 1. Difficulty in defecation: spasm of anal sphincter can lead to difficult or unsmooth defecation, indifference to bowel movement, dryness of stool, such as the emergence of paroxysmal persistent pain, there may be a rupture of the skin of the anal canal. 2. Perianal pain and spasm: patients with spasmodic pain in the area above the anus, with a feeling of fullness and pressure, abscess may occur in severe cases, which can be caused by inflammatory diseases, tumor diseases and vascular lesions. 3. Rectal pain: the pain can last for more than twenty minutes, aggravated when sitting and lying down, and there are chronic and intermittent phenomena. Female patients may also have other symptoms such as vaginal discomfort, and need to undergo anoscopy and colonoscopy to clarify the cause of the disease and timely diagnosis and treatment.