Complications that can occur after a vasectomy include bleeding under the skin, infection at the site of incision, sperm granuloma formation, and chronic pain. These complications are fairly rare but should always be mentioned. In rare circumstances, the vas deferens can regrow and connect, a process called recanalization.
Pain can be present after vasectomy in up to 10% of patients initially, possibly due to back pressure from sperm buildup. This usually resolves after 4 weeks and can be managed with anti-inflammatory medications. It is rare but possible to have chronic pain after vasectomy that does not self-resolve. In these patients, a vasectomy reversal or cutting the nerves responsible in a small follow-up procedure may be indicated.