The incubation period of cold virus is usually around 3-5 days. When the body’s resistance drops due to excessive fatigue or other reasons, the cold virus can easily invade the body. Therefore, if you have a sudden onset of headache, nasal congestion, runny nose, sore throat, cough, and recurring fever, and have been in close contact with someone with influenza or have been to a shopping mall or crowded place before the onset of symptoms, you should be highly suspicious of having a cold. Don’t be nervous after having a cold, for patients with mild symptoms, as long as you pay attention to more rest, drink more water, generally can be cured, because this disease is self-limiting, the course of the disease is generally in 5-7 days or so. However, for patients with more serious symptoms, such as body temperature over 38℃ or obvious symptoms of sore throat, it is recommended to consult a doctor in time for further treatment under the guidance of a professional doctor.