Anal cancer is a malignant tumor of the intestinal tract, and the clinical symptoms of anal cancer are mainly manifested in the following aspects: 1. Early clinical symptoms of anal cancer are not typical, and are generally manifested as itching and discomfort in the anal area, hidden pain and discomfort in the anal area, etc. With the increase of tumor lesions, there are changes in stool habits and stool properties, and blood in stool, with blood mostly being dark red or bright red. 2. Some patients with anal cancer may also have systemic symptoms such as anemia, emaciation, weakness, fever, etc., and masses may be palpated in the anal area. 4. Some lesions may cause complete obstruction, which may lead to clinical symptoms of acute intestinal obstruction, and patients with anal cancer may experience red, swollen, hot and painful skin in the anal area.