Coughing when swallowing saliva may be related to physiological factors or caused by chronic pharyngitis or esophageal cancer. 1. Physiological factors: If you accidentally choke on saliva in the trachea when swallowing saliva, it may cause coughing symptoms, which is a normal physiological phenomenon without special intervention or excessive worry. This is a normal physiological phenomenon and does not require special intervention or undue concern. You can cough up the water that is choked into the trachea through coughing. 2. Chronic pharyngitis: If you suffer from chronic pharyngitis, the long-term stimulation of inflammatory factors, resulting in dry, itchy, painful, foreign body sensation in the throat. Therefore. When the patient swallows saliva, it may cause stimulation to the dry, itchy and painful throat area, which may show cough symptoms. 3. Esophageal cancer: Due to the presence of tumor in the esophagus area, patients may have difficulty in swallowing due to tumor localization. In this case, coughing symptom may appear when swallowing saliva due to difficulty in swallowing, and may be accompanied by hoarseness, choking on food and other symptoms. Coughing when swallowing saliva may also be caused by other reasons, if the symptoms are serious, or there are other obvious signs of discomfort, you should consult a doctor as soon as possible, after a clear diagnosis, to give targeted treatment.