Any procedure no matter how minor carries some risk.
The most common complications are associated with infection or bleeding occurring in 1-3%
Development of a sperm granuloma. This is a hard and sometimes painfull lump about the size of a pea that forms as a result of sperm leakage at the vasectomy site. It occurs in 3-5% of vasectomies.
Congestion of sperm resulting in painful testes. This usually resolves within days or weeks after a vasectomy. It is rare to have persistent testicular pain.
Epididymitis is an inflammation of the epididymis. This is the larger tube connected to the vas deferens. Look at anatomy diagram. This is usually treated with antibiotics
Recanalization-the two divided vas deferens ends finding their way back together. This has been reported as less than 1 in 2000 men undergoing vasectomy.
Development of antibodies-these can be produced by the body in response to the absorbed sperm. These antibodies can possibly affect sperm function such as sperm counts and/or motility. This sometimes can affect fertility after performing a vasectomy reversal
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