Apple and onion water is a food, and food does not have a curative effect, so it is not true. Cough is commonly caused by physiological and pathological reasons, need to be based on the cause of the use of drugs and other ways of treatment. 1. Physiological causes: when the cold air stimulates the trigeminal nerve innervated nose, pharyngeal isthmus mucosa, will cause reflex cough, generally avoid stimulating factors, cough symptoms will be relieved. 2. Pathologic causes: (1) Bronchopneumonia: generally due to infection leading to inflammation of the mucosa, the secretion will increase leading to irritation of the respiratory mucosa, cough will occur. Need to choose drugs according to the causative agent, commonly used penicillin, amikacin and other drugs (2) Pleurisy: Cough is usually caused by inflammation stimulating the pleural nerve, commonly used drugs such as amoxicillin. In addition to the above, cough can also be seen in psychological, mitral stenosis and other causes. The above drugs are prescription drugs and are recommended to be used as prescribed by the doctor. Prolonged coughing or other discomfort, it is recommended to consult a doctor, follow the doctor’s instructions for further examination, with the help of the doctor to clarify the cause, and targeted treatment or treatment, do not blindly believe in the prescription.