A common cold can heal itself in about 1 week, while a severe cold or influenza requires symptomatic treatment for 1-2 weeks to heal. Colds are divided into common colds and influenza, which are mostly caused by viral infections and are self-limiting diseases. Patients with common cold can heal themselves in about 1 week by drinking more water and taking more rest. A small number of patients have symptoms such as fever, body aches, sore throat and cough, which can cause significant discomfort and can be relieved by taking cold medicine. Heavy colds or influenza can cause high fever, headache, and even bronchitis, pneumonia, meningitis, etc. They need to go to the hospital internal medicine department in time and give antiviral and other treatments, which can also be gradually relieved in about 2 weeks. In addition, patients should also ensure adequate rest during the cold, give a light diet rich in nutrients, drink more water, and ventilate the room regularly.