Cough is a common clinical symptom of respiratory tract infection. If you have been coughing for a month and taking medication is not good, it is recommended to go to the hospital for a clear diagnosis, infusion and medication change. Coughing can expel foreign bodies or secretions etc. from the airways and is protective and beneficial. There are various diseases that can cause coughing, such as pharyngitis, tonsillitis, bronchitis, pneumonia, etc. Different treatments are needed depending on the cause. Cough is mainly caused by viral and bacterial infections. Patients need to go to the hospital to have blood tests, a chest CT and a tuberculin test to clarify what causes the cough and treat the cause and symptoms. Generally, coughs need to be treated with anti-inflammatory drugs such as cephalosporins, anti-tuberculosis and anti-allergy drugs. Patients can also take cough medicines to relieve coughing and resolve phlegm. If there is a lot of phlegm, you can drink iced sugar pear water, which has an auxiliary effect. In conclusion, in the case of cough and the ineffective effect of medication, it is recommended to go to the hospital to clarify the cause of the disease and make targeted adjustments and improvements to the treatment plan. The treatment can be assisted with dietary therapy. You can boil water with pears, do not eat spicy and stimulating food, drink more plain water, pay attention to more exercise, improve your immunity, eat more fresh vegetables and fruits, and properly supplement vitamin C and vitamin B to improve your immunity.