The burning sensation in the anus after a bowel movement may be due to the following reasons: 1. Fire: This is a Chinese medicine saying, especially after eating spicy and stimulating food, or drinking a lot of alcohol and after working hard or staying up late. 2. Rectal-related lesions: The burning sensation in the anus after a bowel movement may be due to rectal-related lesions, which can be rectal inflammation or rectal tumors, such as rectal adenomas and rectal cancer. 3, hemorrhoids: anal burning sensation after stool may also be caused by hemorrhoids, especially thrombosed external hemorrhoids, or hemorrhoids combined with infection, more common. If you find that you have a burning sensation in your anus after a bowel movement, it is recommended that you go to a regular specialist hospital for a systematic examination in order to make a clear diagnosis, and then according to the different causes of the disease, timely and symptomatic treatment.