Body odor and itching may be related to poor hygiene, armpit odor, phenylketonuria, diabetes and other reasons. 1. Poor hygiene: some people due to the body sebaceous gland secretion, such as chest and back, scalp and other places sebum secretion is more, at the same time do not pay attention to hygiene habits, not in time to do a good job of their own cleaning, may be the body odor and itching of the skin, it is recommended to maintain good hygiene habits, pay attention to the light diet and so on. 2. Armpit odor: related to heredity and exuberant secretion of sweat glands, in the case of high ambient temperature, tension, etc., the sweat glands in the armpits and folded parts of the secretion of sweat, bacterial decomposition of sweat produces a special smell, and sweat stimulation leads to local itching symptoms. 3. Phenylketonuria: a hereditary disease, patients due to sweat and urine discharge phenylacetic acid, there is a clear rat urine odor, often in the skin eczema, causing itching, pimples and other manifestations. 4. Diabetes: if caused by peripheral neuropathy, can cause itching symptoms, when caused by diabetic ketoacidosis, patients exhale rotten apple flavor. If there is a body odor and itching, it is recommended to go to the hospital in a timely manner to identify the cause, under the guidance of the doctor to treat the symptoms.