The cause of armpit odor is still unclear, some relevant studies show that armpit odor may be related to genetic, environmental, sex hormones, diet, drugs and other factors. 1. Heredity: if there are people with armpit odor in the family, the probability of the disease will increase, and some studies show that armpit odor is a dominant gene hereditary disease. 2. Environment: the occurrence of armpit odor may be related to the surrounding environment, for example, the environment is hot and humid, will also increase the risk of armpit odor. 3. Sex hormones: People in puberty are also at increased risk of developing armpit odor due to the high secretion of sex hormones. 4. Diet: Some studies show that if you often eat raw onions, raw garlic and other foods, it will increase the risk of sweat gland armpit odor. 5. Drugs: If you take arsenic-containing drugs for a long time, it will lead to abnormal odor of sweat. If there is a situation such as armpit odor, it is recommended to seek medical treatment in time to avoid the abnormal odor of the body affecting normal social interaction and mental health.