There is a foul odor on the body to consider is not pay attention to personal hygiene, bad sweating, systemic diseases and so on. 1. Not pay attention to personal hygiene: If you don’t take a bath for a long time, the products of skin metabolism will accumulate on the surface of the body, and the fermentation of these metabolic products will also produce a foul odor. 2. Stinky sweating: due to sweat composition or skin cuticle impregnated by sweat, secretions are decomposed by bacteria, resulting in the emission of unpleasant odor. It is mostly related to heredity, infection and abnormal hormone levels. 3. Systemic diseases: such as diabetes, uremia patients with metabolic disorders in the body, metabolites through the decomposition will also make the body emit an unpleasant odor. There may be other reasons for a foul odor, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, give targeted treatment or treatment.