Serious complications from vasectomy surgery are rare. However, risks include bleeding, blood clot, swelling or bruising in the genital area, fluid build-up in the testicles, and surgical failure (resulting in your partner becoming pregnant). There are many myths surrounding vasectomies that some patients believe. However, a vasectomy will not affect sexual performance, permanently damage your sexual organs, increase your risk of cancer (including prostate cancer), increase your risk of heart disease, or cause severe pain.