The causes of cold genitals include physiological factors and pathological factors such as penile sclerosis, prostatitis and penile cancer. 1. Physiological factors: when the patient is in the cold winter, the stimulation of cold air at this time can lead to the phenomenon of cold genitals. 2. Penile sclerosis: due to various factors, the penis produces nodules, and these nodules will compress the blood vessels of the penis, which will lead to the reduction of blood flow to the penis, so the genitals will also be cold. 3. Prostatitis: because prostatitis triggers the local blood circulation obstacle, the blood flow of the penis is reduced, so the genitals will be cold. 4. Penile cancer: when the tumor cells block the blood vessels, the blood supply to the penis will be insufficient, and then the penis will be cold. There may be other reasons for genital coldness, patients need to consult doctor for examination and early treatment.