It may be that a cold causes chronic bronchitis in the lungs, which is related to smoking. Cough is a common symptom of respiratory tract. It is caused by inflammation, foreign body, physical or chemical stimulation of trachea, bronchial mucosa or pleura. It shows that the glottis closes, the respiratory muscles contract, the lung pressure increases, and then the glottis opens, and air is ejected from the lungs, usually accompanied by sound. Secondly, viral infection can cause general pain and dizziness, so you should take more rest during a cold. Cough breakfast is recommended to eat warm food, such as rice porridge, lean meat, mushroom porridge and so on. The diet is mainly light vegetables, fruits, apples, pears and oranges, and spicy food is not eaten. Strengthen physical exercise and enhance physical resistance.