Colds are classified as a type of disease, and clinically, they are mainly divided into common colds and influenza. They are among the most common respiratory infectious diseases in daily life, caused by viral infections. The common cold is mainly caused by rhinoviruses, adenoviruses, and other viruses, while influenza is mostly caused by influenza viruses or parainfluenza viruses and other pathogens. Symptoms include drowsiness, fatigue, fever, nasal congestion, runny nose, and sneezing. The main treatments include drinking plenty of water, antiviral therapy, and symptomatic treatment.