Problems with the penis can cause pain and affect a man's sexual function and fertility. Penis disorders include

• Erectile dysfunction - inability to get or keep an erection
• Priapism - a painful erection that does not go away
• Peyronie's disease - bending of the penis during an erection due to a hard lump called a plaque
• Balanitis - inflammation of the skin covering the head of the penis, most often in men and boys who have not been circumcised
• Penile cancer - a rare form of cancer, highly curable when caught early