There are many reasons for coughing in the morning but no symptoms during the day, usually considered to be respiratory tract dryness or chronic pharyngitis.
1. Respiratory tract dryness: there is almost no water intake during sleep at night, and dry air passing through the respiratory tract, especially for those who breathe through their mouths, will cause dryness of the respiratory mucosa, which will lead to coughing, and the respiratory aggravation will be worse in the morning when they wake up from sleep, and therefore, the morning is the main cause of coughing.
2. Chronic pharyngitis: often due to tobacco, alcohol, dust stimulation or allergies, respiratory tract lesions and other reasons, chronic pharyngitis will appear secretions, adhering to the posterior wall of the pharynx, but also because of the nose, sinuses, pharynx lesions that occur at night easy to open-mouth breathing, so often wake up in the morning to produce irritating cough and nausea.
Wake up in the morning coughing during the day without symptoms there are other reasons, it is recommended to consult a doctor in a timely manner to identify the cause of the disease, under the guidance of the doctor for treatment.