The main role of the testes is to produce sperm and secrete androgens. At the same time, there is another very important organ in the scrotum – the epididymis. The epididymis is located at the back edge of the testicle and is connected to the vas deferens at one end and to the varicocele of the testicle at the other. When sperm leave the testicle, they run to the epididymis to be stored and continue to grow and mature. In addition to storing sperm, the epididymis also secretes epididymal fluid, which contains certain hormones, enzymes and specific nutrients that help the sperm mature. The epididymis is just like a “little partner” of the testicles, and it is always there, but medical experts have found that the friendship between the “balls” and its “little partner” can turn upside down. The man’s testicles are suddenly enlarged and hardened to be on the alert for testicular tumors Men should also conduct testicular self-examination once a month. The best time to perform the examination is when the skin becomes soft after washing the genitals with warm water. Check by holding the scrotum with your palm and gently rubbing the testicles with your fingers to make them roll. If the symptoms on the right side appear, you have to take care of them urgently, do not avoid the disease and delay it. 1, testicular enlargement This kind of enlargement is mostly found unintentionally when bathing or changing clothes, or when the scrotum is mildly injured by some kind of impact and local touching is done. Most of the swollen testicles are not accompanied by pain, and local pressure is not painful, occasionally there can be a vague pain, but there is always a feeling of swelling in the testicles in the scrotum. 2.Hard testicle The testicle feels like a stone and has a hard texture, which is significantly different from the common testicular inflammation where the testicle is uniformly swollen and does not have a hard texture. Testicular heaviness Since testicular tumor is formed by the massive growth of tumor cells, it is a substantial lump. After growing to a certain extent, the weight of testicles increases suddenly, and patients will have a heavy downward feeling, even affecting walking. If you hold up the testicle with your hand, it is like holding a stone, and there is a certain sense of weight. 4.Acute testicular pain One day, the testicle on the sick side suddenly occurs severe pain, like a testicular torsion lesion, which turns out to be caused by the sudden occurrence of bleeding, embolism and ischemic necrosis of the testicular tumor tissue. 5.Acute abdominal pain The testicular tumor in high position can reflexively cause lower abdominal pain due to pulling the nerve by dropping downward. Especially for the cryptorchid located in the abdominal cavity, in case of malignant transformation and testicular torsion, the acute abdominal pain is very strong. For example, tumors such as embryonal carcinoma, chorionic epithelial carcinoma and teratocarcinoma can produce a large amount of gonadotropins, and the increase of such hormones in the body can stimulate breast enlargement. 7, infertility The testicular tumor will destroy a lot of sperm production institutions in the testicles, which will cause infertility.