Wife has been coughing for the last three month non stop. been to the hospital and nothing prescribed helps. what do i do? please help us out.

Chronic cough: Several possible reason. Some blood pressure medication might cause dry cough. Some upper airway viral infection might last long. Pertussis is coming back to the community. Asthma sometimes presents as a chronic cough, a clue is family history of asthma, or person frequent cold and cough as a child. You might need a chest xray and then see a pulmonologist.