Most testicular cysts are very small, so there are usually no symptoms. Some may present with swelling and pain in the affected testicle. Most testicular cysts are small in size and usually do not cause much harm, but larger cysts may be harmful to fertility. 1. Symptoms: As there is a dense white membrane on the outside of the testicle, with little elasticity and rich innervation on the surface, slight changes in the volume of the testicle may stimulate the white membrane of the testicle. There may be swelling of the affected testicle as well as painful pulling sensation. 2. Harm: If the cyst is large in size, it will compress the surrounding tissues, which may adversely affect the spermatogenic function of the testis, leading to a decrease in the quality of the patient’s semen, which in turn affects fertility. Although the possibility of malignant transformation of testicular cysts is relatively low, when testicular cysts are found, they should be examined in time, and their nature should be clarified and treated with the help of doctors.