The phenomenon of itchy penis without other symptoms may be caused by personal hygiene, or it may be caused by excessive masturbation, penile eczema or allergy. 1. Personal hygiene: some people do not pay attention to personal hygiene and lead to the penis and other parts of the bacterial growth, dirt accumulation, which may appear penis itch, and not accompanied by other symptoms. 2. Excessive masturbation: a way for men to vent their sexuality, excessive masturbation can lead to localized damage to the penile skin, which in turn leads to the invasion and infection of various pathogenic bacteria, which may lead to penile itching. 3. Penile eczema: due to bacterial, fungal and other pathogenic bacteria infection or local sweating, humidity, friction, resulting in eczema-like changes in the penile skin, thus showing penile itching and no other symptoms of the phenomenon. 4. Allergic factors: some people may be in contact with certain allergens that cause stimulation of the penile skin and mucous membrane, resulting in penile itching without other symptoms, such as clothing, pants or toiletries. If the above symptoms occur, it is recommended to identify the cause of the disease and take corresponding therapeutic measures to alleviate the occurrence of symptoms.