A soybean-sized lump on the left epididymis may be caused by chronic epididymitis, epididymal tuberculosis and epididymal cysts. 1. Chronic epididymitis: chronic epididymitis is associated with chlamydial infection, other urinary tract infections and acute infections that do not heal, the patient may have a soybean-sized lump in the left epididymis, and some patients may also have symptoms of enlargement and hardening of the epididymis on the affected side. 2. Epididymal tuberculosis: Epididymal tuberculosis is the most common tuberculosis of the male reproductive tract, and the patient will have a soybean-sized lump on the left epididymis, which is hard and usually accompanied by fever or night sweating (sweating abnormally after falling asleep, but the sweating stops after waking up). 3. Epididymal cysts: Epididymal cysts are fluid-filled sacs in the location of the epididymis, and patients will have the symptom of a soybean-sized lump on the left epididymis. When the patient has a soybean-sized lump on the left epididymis, he should go to the hospital for ultrasound examination of the epididymis in a timely manner to clarify the cause of the disease and then follow the doctor’s instructions for treatment.