Occasional coughing may be caused by physiological reasons, and may also be caused by colds or diseases such as pneumonia. 1. Physiological reasons: some special circumstances can occur occasionally cough a few times, such as throat is too dry, sudden inhalation of hair and so on. 2. Pathologic causes: (1) Cold: being infected by virus can cause cold disease, which is easy to cause irritation to the throat area and induce the symptom of coughing a few times occasionally. (2) Pneumonia: Pneumonia is caused when the lungs are attacked by bacteria, viruses and other microorganisms. Suffering from this disease will affect the functioning of the lungs, causing the patient to experience a variety of symptoms such as chest tightness and coughing, which may also cause the existence of the above mentioned conditions. Occasional coughing may also be caused by other reasons, such as colds, bronchitis, lung infections, cough variant asthma, gastroesophageal reflux stimulation, etc. If the symptoms fail to improve or even gradually worsen, it is necessary to consult a regular hospital in a timely manner, and cooperate with the doctor to improve the examination and standardized treatment.