Men have blood on the front side of the underpants for no reason, consider with glans, urethritis, trauma and other factors, need to go to the hospital for further examination to clarify the cause of the disease, and timely medical treatment. 1. glans: usually due to glans inflammation stimulation, resulting in glans mucosa with a small amount of bleeding symptoms, which in turn caused the phenomenon of men’s blood in the front of the panties for no reason, glans inflammation may appear erosion and other symptoms. 2. Urethritis: usually due to urethritis caused by urethral epithelial cell congestion, edema, local vascular permeability increases, causing men to have blood in the front of the underpants for no reason, urethritis will usually appear urinary pain and other symptoms. 3. trauma: may be due to the genitals by more intense impact or extrusion, caused by the phenomenon of men’s blood in the front of the underpants for no reason, trauma usually appear pain, fever and other symptoms. If there is blood on the front of the male underpants for no reason, you should consult a doctor in time to clarify the cause of the problem and then treat it under the guidance of the doctor.