A large testicle without discomfort is usually caused by testicular cysts, congenital dysplasia, and the effects of trauma. 1. Testicular cysts: may be due to testicular lesions, some cysts are painless and will not affect the testicles, some need cystectomy surgery. 2. Congenital dysplasia: these patients grow up with one large testicle and one small testicle, which is manifested by one side of the testicle being very small in size and soft in texture, while the other side of the testicle is bigger, even slightly bigger than the normal one. 3. Trauma: Trauma can cause internal bleeding and hematoma in the testicle, thus causing insufficient blood supply to the testicle, which will gradually shrink and lead to a large and small testicle with no abnormal feeling. Tips: Normal people’s testicles are not equal in size on both sides, if there is no discomfort, there is no need to consult a doctor, but if one side of the testicle suddenly becomes bigger or accompanied by discomfort, please consult a doctor immediately.