Vasectomy Complications

Vasectomy is a simple procedure.  Complications are unusual but possible.



Excessive bleeding occurs in less than 5 percent of men.  Most bleeding problems occur within 8 hours postoperatively.  Bleeding within the scrotum can lead to a haematoma which is an expanding mass of blood within the tissues around the vas.


Infection occurs in up to 4 percent of men who have a vasectomy.  This usually involves the scrotal skin around the incision.  Occasionally, the epididymis will become swollen and is usually treated with a short course of oral antibiotics.

Sperm granuloma

A sperm granuloma may occur, which is a small lump that develops over time as a result of the body’s immune reaction to sperm leaking from the cut end of the vas.

Post-vasectomy pain syndrome

A feeling of fullness from sperm congestion occurs in up to 6 percent of men after vasectomy.  This is due to stretching of the surface of the epididymis from stored sperm cells.  The full sensation usually resolves after a few weeks and requires no treatment, but a very small number of men may develop chronic pain.


Pregnancy can occur if a man fails to abstain from sex or use alternative contraception until one clear semen test has been achieved.  There is a 1-2000 chance that the cut vas will spontaneously re-join, following a negative semen test.