In men, a hard blood vessel in the coronal region may be the result of superficial vein engorgement with normal sexual stimulation. It may also be caused by diseases such as sclerodactyly and penile cancer. 1. Physiological factors: the presence of superficial veins around the coronal region in men can lead to congestion of the corpus cavernosum when the brain sends a signal. The more rapid circulation of blood in the veins in the coronary region may show the phenomenon that there is a hard blood vessel in the male coronary region. 2. penile sclerosis: penile sclerosis belongs to connective tissue disease, usually seen in middle-aged and elderly men. This kind of patients may have persistent damage to the local white membrane, which leads to structural changes of the surrounding connective tissue, forming fibrous plaques, and a few of them show cord-like changes. 3. Penile cancer: penile cancer is a malignant tumor originated from the head of penis, coronal sulcus and within the mucous membrane of prepuce. A few patients with penile cancer will find a hard blood vessel in coronal region, which is actually localized malignant mass and papule. There are more causes of a hard blood vessel in the coronal region in men, and it is recommended to seek medical treatment in time, take relevant examination and then choose appropriate treatment measures.