A cough without cold symptoms is considered to be caused by allergic pharyngitis, cough variant asthma, bronchitis or pneumonia. If the cough is without phlegm, with a tickling throat and irritating paroxysmal dry cough, it is most often caused by acute pharyngitis or allergic pharyngitis. If the cough occurs in the early morning or the second half of the night, it is related to cold air irritation, and you need to consider whether you have cough variant asthma if you usually have allergies. In the case of bronchitis and pneumonia, the cough can have a longer duration, mostly coughing for more than 1 week.