When the penis hurts when there is sweat, it may be some kind of physiological phenomenon, or it may be caused by diseases such as circumcision and phimosis. 1. Glandulitis: is the inflammation of the glans area due to irritation, infection, trauma and other reasons, patients usually show local ulcers, erosion, redness and swelling, when the penis has sweat, it may stimulate the affected area, resulting in the feeling of penile pain. 2. Penile inflammation: most of the inflammation caused by infection or irritation, usually manifested as redness, swelling, itching or pain in the penis, inflammation may not be obvious at the beginning of the pain symptoms, when the penis is sweating so that the penis is stimulated, there will be pain in the penis, or the pain is aggravated. Penile sweat pain may also have other causes, it is recommended that patients seek medical attention in a timely manner, under the guidance of a doctor to clarify the cause of the disease, to take corresponding treatment measures.