In clinical terms, acute upper respiratory infection and upper respiratory infection usually mean the same thing, and there is no significant difference between them. Upper respiratory infections are typically acute, so sometimes they are simply referred to as upper respiratory infections without specifically mentioning 'acute.' Acute upper respiratory infections and upper respiratory infections generally have no difference; patients are often infected by viruses, typically presenting symptoms such as runny nose, sneezing, sore throat, coughing, and sometimes accompanied by fever. There may also be associated muscle soreness, fatigue, and headaches, but patients often experience low-grade fever rather than high fever. For these issues, symptomatic treatment is usually needed, and through such treatment, patients often recover on their own.