After lifting heavy weights, i started to experience my testicles swelling. i have no discomfort or pain just the swelling, will the swelling go away?

Very heavy lifting can cause congestion in the veins of the scrotum but I don't think it causes actual swelling of the testicles themselves. Sometimes it can cause epididymitis which is quite painful!. Inguinal hernias can be caused by heavy lifting. Venous congestion after heavy lifting and straining should resolve soon after stopping straining.