Mild soreness and pain is common after vasectomy.Such discomfort generally resolves after a few days. Rarely the patient may experience a dull ache in the testicles following vasectomy that may last for a long time. It is thought to be caused obstruction to epididymis, nerve entrapment in the vasectomy scars, inflammation and some other unexplained phenomenon. If this condition occurs, it usually disappears within six months. Very rarely it may last longer than six months and is commonly known as post vasectomy pain syndrome.