A hard lump the size of a soybean felt on the side of the epididymis for 10 years may be the result of epididymitis, epididymal nodules and other diseases. If there is no change for a long time, there is usually no need to worry. 1. Epididymitis: usually caused by pathogenic microbial infections, autoimmune disorders and other factors leading to inflammatory lesions in the epididymis. Chronic epididymitis usually manifests itself as vague pain in the affected scrotum, accompanied by a feeling of swelling and falling, and a hard lump the size of a soybean may be felt. 2. Epididymal nodules: chronic epididymitis has a long duration, fibrous hyperplasia of epididymal tissue, there will be a lot of scar tissue, resulting in nodular lesions in the epididymis. Patients can feel soybean-sized hard lumps on the side of the scrotum. Patients should go to the hospital for regular medical checkups, and if other discomforts occur, they should be treated accordingly under the guidance of the doctor in a timely manner.