Patients have a strong early morning cough for the following reasons: 1. Infectious diseases of the respiratory system: let’s say viral, bacterial, mycoplasma, chlamydia and other pathogenic microbial infections that cause colds, acute pharyngitis, acute tracheobronchitis, lung infections, etc. 2. Phlegm-rich diseases: let’s say acute exacerbation of chronic obstructive pulmonary disease, bronchiectasis and infections, etc., which cause patients to cough and sputum more, and after sleeping overnight 3. Sub-acute or chronic coughs: subacute or chronic coughs, such as gastroesophageal reflux cough, post-infectious cough, cough variant asthma, eosinophilic bronchitis, variant cough, etc., may also cause a strong early morning cough. 4. The cough may be aggravated by irritating odors such as cold air, and gastroesophageal reflux cough may also be accompanied by aggravation of the cough after eating, among other symptoms.