What causes phlegm in the throat upon waking up in the morning?
Generally speaking, the throat refers to the pharynx. Having phlegm in the throat upon waking up in the morning may be caused by accumulated saliva at night, respiratory tract cleaning mechanisms, postural changes, rhinitis, bronchitis, or other factors. If discomfort occurs, timely medical consultation is recommended. Detailed analysis is as follows:

1. Accumulated Saliva at Night
During sleep at night, oral activity decreases and saliva secretion slows down but continues. Some saliva may accumulate in the throat area, mixing with oral microorganisms and airborne dust particles, forming phlegm. Drinking an appropriate amount of water before bedtime to keep the mouth moist and using a humidifier to increase indoor humidity can help reduce the viscosity of saliva at night.
2. Respiratory Tract Cleaning Mechanism
The respiratory tract has a self-cleaning function, moving foreign particles, bacteria, etc., toward the throat through ciliary movement, expelling them in the form of phlegm. This cleaning activity is especially active when waking up in the morning. Avoid consuming irritating foods or drinks before bedtime to reduce respiratory tract irritation.
3. Postural Changes
When transitioning from a lying position to an upright position in the morning, postural changes can promote the downward movement of phlegm in the throat area, stimulating the cough reflex, thus creating the sensation of having phlegm in the throat. It is recommended to move slowly after waking up, such as taking deep breaths and doing light stretching exercises, to help the body adapt to postural changes and reduce discomfort.
4. Rhinitis
Rhinitis is mainly caused by external factors such as viruses, bacteria, allergens, and internal factors such as genetic predisposition and nasal mucosa susceptibility, resulting in nasal mucosal inflammation. Under the stimulation of inflammation, nasal secretions increase, flowing backward into the throat area, causing phlegm production, and may also be accompanied by symptoms such as nasal congestion and runny nose. Treatment can be carried out under a doctor's guidance using medications such as Rhinitis康 tablets, Xanthium Rhinitis Capsules, and Budesonide nasal spray.
5. Bronchitis
Bronchitis may be caused by viral or bacterial infections, smoking, air pollution, etc. Inflammation of the bronchial mucosa leads to increased secretions, which may result in phlegm in the throat upon waking up in the morning, accompanied by symptoms such as coughing and wheezing. Patients may follow medical advice to use medications such as Ambroxol Hydrochloride Oral Solution, Bromhexine Tablets, and Cefixime Dispersible Tablets for treatment.
Maintaining a healthy lifestyle is important, including quitting smoking, limiting alcohol consumption, balanced diet, moderate exercise, and enhancing immunity. Practicing good personal hygiene, frequent handwashing, and avoiding close contact with individuals suffering from respiratory diseases can help reduce the risk of infection.