Hard lumps on epididymis may be caused by epididymitis, epididymal cyst, epididymal tuberculosis and other factors. 1. Epididymitis: usually associated with pathogenic bacterial infection, can lead to localized damage to the epididymis, which will make the epididymis localized hard lumps, may also be accompanied by pain, redness, scrotal swelling and other symptoms. 2. Epididymal cyst: the common part is the head of epididymis, the main clinical symptoms of epididymal cyst is usually have scrotal swelling, or no obvious symptoms, no special discomfort, the examination can be manifested as epididymal mass, when the epididymal cyst tension is large, it can also be manifested as hard lumps on the epididymis. 3. Epididymal tuberculosis: usually associated with tuberculosis infection, with the aggravation of the lesion, it can lead to the presence of localized swelling in the epididymis, which may also be accompanied by symptoms such as low-grade fever and fatigue. There are many reasons for hard lumps on epididymis, and there may be epididymal tumors, etc. It is recommended to go to the doctor for examination, to clarify the specific causes, and to carry out targeted treatment to prevent other complications.