Adults who catch colds every three days usually have a decreased immunity, so they need to pay attention to exercising, strengthening the body, ensuring balanced nutrition, and avoiding various factors that trigger colds. 1. Exercise to enhance physical fitness: “Life lies in movement”, it is very important to insist on physical exercise to enhance body resistance and prevent diseases. Insist on outdoor aerobic exercise for 1 hour every day, such as jogging, walking, bicycling, climbing, etc. Older adults can also choose tai chi, gymnastics and so on. 2. Ensure balanced nutrition: the lack of some trace elements, such as zinc, selenium, etc., easy to cause immunity decline. Ensuring comprehensive and balanced nutrition is conducive to maintaining the immune function. Dietary supplementation of high-quality protein foods, such as lean meat, eggs and milk, and vitamin-rich vegetables and fruits, focusing on meat and vegetables, adhere to a light, low-fat diet. 3. Avoid factors that induce colds: add clothes in time when it’s cold, wear a mask when you go out during the flu season, and reduce the number of people going to public places. Patients who are prone to colds can consider taking the flu vaccine for passive immunization after the fall, which can reduce the number of influenza occurrences in the fall and winter. We recommend that you consult a doctor in a timely manner, complete the relevant laboratory tests to clarify the condition, and follow the doctor’s instructions for standardized treatment according to the cause of the disease.