An unpleasant odor in the elderly may be related to age, endocrinology, disease, personal hygiene and other reasons. 1. Age, endocrine: after 40 years old, the human body is easy to secrete 2-nonenal, when its concentration is getting higher and higher, people will produce a strange smell. 2. Disease: If the elderly suffer from diabetes, in the case of poor blood sugar control, it is likely to cause complications, such as kidney damage, diabetic foot, etc., can appear urine odor, ulcerated unpleasant odor. 3. Personal hygiene: if the elderly do not pay attention to oral cleaning as well as body cleaning, etc., due to bacterial reproduction, may allow the mouth, skin odor, etc.. It is recommended that the body has an unpleasant smell of the elderly to go to the regular hospital in a timely manner, such as the need for treatment, should be standardized under the guidance of the doctor.