Fox odor is generally referred to as armpit odor, girls have armpit odor at the age of seven or eight years old, consider and stinky sweating disease related. The sweat secreted by the sweat glands has a special odor or the sweat is broken down to produce a foul smell called hyperhidrosis. The causes of hyperhidrosis are related to metabolic diseases, food and family genetics. 1. Metabolic diseases: metabolic diseases such as phenylketonuria, etc., can result in stinky sweat due to abnormal secretion of amino acids and their analogs, leading to armpit odor. 2. Food: some people can produce odor through exocrine sweat gland excretion after consuming onion, garlic and mustard. 3. Family genetics: parietal secretory sweat glands lead to stinky sweat associated with family genetics, most of the patients have a family history. Sweat glands secreted by the parietal sweat glands is initially odorless, bacteria and parietal sweat gland secretions mixed with unsaturated fatty acids can produce an odor. Girls with armpit odor at the age of seven or eight are advised to pay attention to personal hygiene, take a bath every day, keep the area dry and clean, increase the amount of water consumption, and reduce the intake of stimulating foods. When you are an adult, you can go to the dermatology department of the hospital and be given appropriate treatment under the guidance of the doctor.