Cough, asthma, phlegm. What's going on?

Cough, asthma and sputum are more likely to be caused by asthma, heart function impairment, chronic lung disease and other factors. Bacterial infection of the upper respiratory tract, such as pneumonia, bronchitis and other diseases are the most common. Patients need to go to the hospital for examination to determine the cause before treatment, so as not to delay disease treatment.