Can a Vasectomy Cause Low Testosterone?

Short answer: no, a vasectomy does not cause low testosterone. The procedure only affects the small tubes that transport sperm — it doesn't touch the parts of the testes that produce testosterone. If your testosterone has changed after a vasectomy, the timing is probably coincidence rather than cause.

Why vasectomy doesn't affect testosterone

A vasectomy cuts and seals the vas deferens — the small tubes that carry sperm from the testes to the urethra. Testosterone is produced by Leydig cells inside the testes themselves and released directly into the bloodstream, not into the vas deferens. The two systems run in parallel and don't depend on each other.

After a vasectomy, sperm production continues (briefly) and is then naturally reabsorbed; testosterone production is unaffected.

If testosterone has dropped post-vasectomy

Most likely it's coincidence. The age range that typically has vasectomies (mid-30s to 50s) overlaps with the age range where natural testosterone decline becomes noticeable. The vasectomy and the testosterone change are happening for separate reasons at the same life stage.

Other possibilities: lifestyle changes around the same time, weight gain, sleep changes, new medications, increased stress. Worth thinking through with a doctor.

When to test

If you've had a vasectomy and are noticing several low-T symptoms, a testosterone test is reasonable. See our guide to testosterone testing in Singapore.

Speak to a doctor on Noah

Book a confidential consultation with a Singapore-licensed doctor on Noah if you'd like to discuss what's happened.