Colds are caused by viral infections and are categorized into common cold and influenza. The main symptoms of common cold are runny nose, sneezing, sore throat, cough, headache, fever, mostly low-grade fever, and symptomatic treatment is usually required; influenza symptoms are similar to those of the common cold, but are prone to high fever and symptoms such as significant headache and muscle aches and pains, and in addition to symptomatic treatment, antiviral treatment may also be required. 1. Common cold: Common infections may be caused by viral infections such as rhinovirus, adenovirus, respiratory syncytial virus, etc. Typical manifestations are runny nose, sneezing, sore throat, coughing, and headache, etc. If there are febrile symptoms, they are usually low-grade fever. There is no specific treatment for the common cold, but symptomatic treatment, such as rest and hot water, is usually needed. 2. Influenza: Influenza is caused by influenza virus infection, which has some similarity with the symptoms of the common cold, but most of them are characterized by high fever and more prominent symptoms such as headache and muscle aches. The disease also requires symptomatic treatment and may need to be treated with antiviral drugs such as oseltamivir. However, it should be noted that the common cold or the flu may be combined with bacterial infections, and in the case of bacterial infections, antibiotic treatment is required, so the condition needs to be monitored under the guidance of an offline doctor to standardize treatment.