Not catching a cold for three years is normal, indicating that the body’s resistance is relatively strong, so there is no need to worry too much if you don’t catch a cold for a long time. Colds are only abnormal because the body’s immunity drops after an outside virus invades the body, thus a cold occurs. For people with better immunity, it is very likely that they will not catch a cold for a long time, which is normal. Therefore, for people who often catch colds, in order to alleviate this situation, it is necessary to constantly strengthen the body’s immunity, such as regular work and rest, good habits, proper exercise, a balanced and nutritious diet, and to avoid being cold and tired.