The possible causes of testicular drop and pain are as follows: 1. Testicular infection or epididymitis, commonly caused by viral or bacterial infection, mostly caused by retrograde spread of urethral infection, after infection, the testicle or epididymis may increase in size and be accompanied by obvious swelling and pain, and even the appearance of red scrotal skin, and a series of accompanying symptoms such as fever, some patients may have the symptoms of frequent and urgent urination, and need to The testicular ultrasound examination is needed to confirm the presence of testicular enlargement and inflammatory changes, etc. 2. varicocele can also appear as a testicular drop, pain, slightly enlarged testicular volume when touched, but thickened spermatic vessels can be touched around the testicle, and accompanied by a feeling of drop. 3. testicular tumor, when there is a malignant tumor of the testicle The testicles can be enlarged in size, and the swelling and pain are not obvious in the early stage, and then the testicles gradually increase in size and have an obvious feeling of falling, and when touched, the testicles can be hardened, similar to the feeling of touching a stone, and accompanied by a certain amount of pain.