Viral mumps is mainly caused by the mumps virus, which is highly contagious and generally spreads through the respiratory tract, once it occurs it needs to be isolated to prevent a mass epidemic, the symptoms are mainly the following: 1. swelling of one cheek or both, the pain is not particularly severe in the first 2-3 days of infection, light pressure will be painful, the swollen area is like a pear shape, mostly centered on the earlobe, then slowly backwards and forwards and downwards The edges of the swelling are not clear, and the skin surface is red, shiny and taut. The swollen area will further aggravate with the development of the disease, and the patient will have restricted mouth opening and severe pain when chewing food, which usually lasts about 7 days. 2. If the virus multiplies in the oral and nasal mucosa on a large scale and enters the bloodstream, it will lead to systemic symptoms, such as fever, vomiting, pain, etc., and even mumps orchitis.