“What are the side effects of inguinal hernia surgery?”

Side effects I usually ascribe to medicines - an undesirable effect of having your hernia fixed, I cannot think of any. Complications of the surgery - what can go "wrong" during surgery will depend on how your hernia is fixed: open vs laparoscopic; with mesh or without. And your surgeon will go over those with you based on how they plan to fix your hernia

Main side effects posiible nerve damage, bledding, infection and adhesions/scarring.