An unpleasant odor on the body of the elderly may be related to skin aging, hygiene habits, diabetes and so on. 1. Skin aging: as the elderly age, the skin’s antioxidant capacity will be weakened. Will secrete a substance called 2-nonenal, when 2-nonenal substance accumulation, and air bacteria contact oxidation, the body will show a bad smell. 2. Hygienic habits: with age, due to the elderly digestion, reproductive function decline, autonomy decline, incontinence did not change clothes in a timely manner, urine stored in the clothes, there will be some unpleasant odor, life can be a good clean, pay attention to personal hygiene. 3. Diabetes: the elderly if they suffer from diabetes, when fat burning, the body will appear ketone bodies, ketone bodies once too much will trigger diabetic ketoacidosis, the elderly will appear on the body of the odor of rotten apples. Older people once there is an unpleasant odor, should seek medical attention, identify the cause of the disease, follow the doctor’s instructions for symptomatic treatment.