Swelling of the right testicle may be caused by testicular trauma, orchitis, epididymitis and other conditions. 1. Testicular trauma: usually the patient’s testicle is stimulated by external force, which leads to testicular injury, and localized swelling, pain and other symptoms will often appear in the early stage, and some patients may also show that the testicle is enlarged and hard, etc. And the patient may also have fever, nausea, vomiting and other phenomena. Some patients may also have swollen and hard testicles, which may be accompanied by fever, nausea, vomiting and so on. 2. Testiculitis: usually due to bacterial, viral, chlamydial and other pathogens infection, and can also be sexually transmitted and non-sexually transmitted. Generally, patients with acute orchitis will have high fever, chills, enlarged testicles, pain and other symptoms, which can also be radiated to the scrotum and inguinal area on the same side, and if an abscess is formed, local fluctuating sensation can also occur. 3. Epididymitis: usually due to bacterial infection, urinary reflux, sexually transmitted infections and other conditions, and also related to bad sex, obstruction factors, urinary tract infections and so on. Patients often appear one side of the scrotum rapid swelling, and with the development of the disease, can also touch the epididymis hardening, vas deferens thickening, etc. If epididymitis in the involvement of testicles, can also appear on the same side of the testicles and enlargement of the phenomenon. In addition, there are many other reasons that can lead to the swelling of the right testicle, it is recommended that patients with right testicular enlargement, according to their own symptoms, under the assessment of the doctor to clarify the cause of the disease, reasonable treatment.