Possible reasons for coughing old and bad include: respiratory infections, low immunity, allergic cough, chronic bronchitis, bronchiectasis and other causes.
1. Respiratory infections: due to pathogens invading the respiratory system, symptoms of coughing, if untreated or insufficient treatment, may result in a bad cough.
2. Low body immunity: such as respiratory tract infections, due to low immune function, can not well resist the repeated invasion of viruses and pathogens, resulting in prolonged course of the disease, cough for a long time bad.
3. Allergic cough: it is a cough caused by exposure to allergens, and if it cannot be separated from the allergens, it may lead to coughing symptoms that never get better.
4. Chronic bronchitis: the clinical manifestation of this disease can be cough, and the disease has a long duration, if the cough has not been improved, may be due to this disease.
5. Bronchiectasis: the main symptoms are persistent or recurrent cough and sputum. If you suffer from this disease, it can be manifested as a cough that does not get better.
If you find a persistent cough does not get better, you should go to the hospital in a timely manner, carry out relevant examinations, identify the cause of the disease, under the guidance of the doctor for the cause of the treatment.