I have hydrocele my right testicle became larger than normal. When do doctors have to do surgery?

Hydrocele. I tell my pts that when the swelling becomes bothersome it may be time for surgery....Very small hydro else can be watched but usually grow....
When it bothers you. Depends upon size of the hydrocele and how much discomfort is present specially when walking or exercising. There is no rush for surgery, but a scrotal ultrasound is worth getting to rule out anything nasty going on with your testicle. Fyi: the famous writer george bernard shaw went thru many many years , until his death, with a huge hydrocele down to his knee because he didn't trust surgeons.