Hydrocele in adults is a condition common among men ages 40 and over. It occurs when fluid builds up in the scrotum, resulting in swelling and increased pressure. Although it can be uncomfortable, it is usually not severe or life-threatening. The most common symptom of hydrocele is a painless swelling of the scrotum that may come and go, with the swelling becoming larger when standing and smaller when laying down. Other symptoms include redness and tenderness of the scrotum, discomfort or pain, itching, burning sensation or difficulty walking.