The smell of sweat in the armpits is called hyperhidrosis, and there are two possibilities for this condition: one is caused by small sweat glands, and the other is caused by large sweat glands. One is caused by the sweat glands, and the other is caused by the sweat glands. The sweat glands are caused by epidermal bacteria that break down the surface of the skin, and are usually accompanied by hyperhidrosis. The sweat gland caused by the odor sweating and hormone levels have a relationship, usually after puberty is more serious, old age gradually alleviate, usually pay attention to local hygiene, often bathing, keep the skin dry, you can scrape the armpit hair, reduce the number of local parasitic bacteria. In the treatment can use 2% -4% formaldehyde solution or urotropin solution, can also use botulinum toxin local injection to reduce the activity of the nerve sweat glands, the more serious can be injected with local sclerosing agent, physical therapy can choose high-frequency electro-acupuncture or laser hair removal, the condition is serious, you can choose minimally invasive surgical treatment.