If patients find anal odor, the specific causes are as follows: 1, physiological causes: possible causes are due to inattention to personal hygiene, long periods of time without bathing, resulting in the local accumulation of dirt and malodor. 2, pathological causes: such as gas-producing bacterial infections caused by, or due to malignant tumors of the rectum local breakdown resulting in bacterial multiplication, the emergence of mucus pus and blood stool and caused. There may also be due to more serious hemorrhoids, which are not easily wiped clean when wiping stool, which can lead to fecal residue and anal odor. If you find an obvious anal odor, it is recommended that you go to a regular specialist hospital for a systematic examination in order to make a clear diagnosis, and then treat the problem in a timely manner according to the different causes. If it is caused by inattention to personal hygiene, it is necessary to clean the area daily.