Whether sometimes coughing and sometimes not coughing is a problem depends on whether the cough is due to certain diseases. Normally coughing is a reflexive defense action of the organism, through which secretions in the airway and foreign bodies in the airway can be removed. If the patient has a cough, it is important to distinguish whether it is caused by an environmental irritant or by the presence of some organic disease. If the patient smokes or works in a poor environment, there is smoke, dust stimulation, can appear cough, some patients can also appear to cough sputum, in this case just need to quit smoking, away from the stimulating environment can be. If the patient does not have these conditions is a long-term cough, it is recommended that the patient to do CT lungs to see if there is organic disease, if there should be symptomatic treatment. There are some other clinical diseases that can cause patients to cough, such as cardiovascular factors, gastroesophageal reflux disease, habitual and psychological factors, etc., can lead to coughing, the specific problems need to be analyzed.