<p>Problems with the penis can cause pain and affect a man's sexual function and fertility. Penis disorders include:</p><ul> <li> <a href="https://medlineplus.gov/erectiledysfunction.html">Erectile dysfunction</a> - inability to get or keep an erection </li> <li> Priapism - a painful erection that does not go away </li> <li> Peyronie's disease - bending of the penis during an erection due to a hard lump called a plaque </li> <li> Balanitis - inflammation of the skin covering the head of the penis, most often in men and boys who have not been circumcised </li> <li> Penile cancer - a rare form of cancer, highly curable when caught early </li> </ul>