Orchitis causes swelling of the testicles, redness of the scrotal skin, and a painful drooping sensation in the testicles; it is mostly caused by infections in other reproductive tracts, and the spread of bacteria to the testicles through the lymphatic or vas deferens. 1. Symptoms: Most of the time, testicular pain will appear suddenly, and its nature will be gradually intense and radiate to the groin, the testicles will become bigger in size, and the skin of the scrotum will be red and swollen. Some may cause systemic complications such as fever, nausea, vomiting, and fatigue. 2. Etiology: Inflammation of neighboring organs such as urethritis, cystitis, prostatitis, etc., the bacteria will spread to the testicles through the lymphatic vessels; in addition, there may also be cross-transmission through sexual contact; if it is viral testicular inflammation, it may be due to the complication of mumps; it may also be traumatic and immune factors also have a certain relationship. The testicular inflammation should go to the regular hospital surgery in time for examination, and follow the doctor’s instructions for treatment.