There are many reasons for catching colds all the time, such as poor physical condition, malnutrition, and underlying diseases. 1. Poor physical condition: Some people are born with weak physical condition or often stay up late at night and do not exercise, resulting in weak physical condition and low body resistance, which can easily cause pathogens to attack and cause respiratory infections, thus leading to the phenomenon of colds all the time. 2. Malnutrition: Long-term lack of vitamins and trace elements can cause nutritional imbalance and affect the body’s resistance, which can lead to colds and flu, especially in dieting, picky eaters and people who are partial to food. 3. Underlying diseases: If there are underlying diseases, such as diabetes, AIDS, chronic hepatitis, etc., it will also cause the immune system to decline, resulting in colds all the time. 4. Other: Having cold symptoms is not necessarily a cold. Such as nasal congestion and runny nose, may be allergic rhinitis; repeated coughing, may be cough variant asthma and other diseases. There are many reasons why you always have a cold, if you have a recurring cold, we recommend that you go to the hospital in time to complete the examination and take standardized treatment as prescribed by the doctor.