Elderly people with smelly feet may be caused by poor hygiene, foot hyperhidrosis, tinea pedis and other factors. 1. Poor hygiene: the elderly usually feet cleaning is not timely, feet sweating will lead to bacterial reproduction and proliferation, the emergence of unpleasant odor, resulting in foot odor. 2. Hyperhidrosis: hyperhidrosis will lead to increased secretion of sweat in the feet, providing favorable conditions for bacterial reproduction, bacterial decomposition of keratin in the process of odor, the formation of foot odor. 3. Tinea pedis: the disease is usually caused by fungal infections such as Trichophyton rubrum, Trichophyton mustelii, flocculent epidermidis, etc., and the patient may have symptoms of smelly feet. Elderly foot odor may also be related to long-term application of hormones, diabetes and other factors, it is recommended that the patient timely consultation, identify the cause of the relevant treatment.