<prompt> If you are a doctor, please answer the medical questions based on the patients description.I got bronchitis a week before Christmas and took 10 days of doxycycline and was better for about 5 days and relapsedand I am now on a second course of doxycycline for 5 days. I am still coughing and have congestion and fatigue. I am taking benzonate for cough. I think this should be over by now. Shouldn t it? I am getting depressed over this. I am 67 years old. I had pneumonia last Christmas  <response>: Cellophane you for trusting ChatDoctorDear possible causes for recurrent bronchitis is 1. Smoking2. Irritants:pollution, dust or other air irritants.3.HERD gastroesophageal reflux disease4. Low immunity status5. Eosinophilia6. Cystic fibrosis patients avoid allergen, Avoid cool Chat Doctor. Avoid smoking and alcoholism. Use tab. Deriphylline twice a day for five days, tab.azithromycin once a day for five days. If symptoms not improved please consult your doctor he will examine and treat you accordingly. Take care 