Bitter throat may be caused by chronic pharyngitis, reflux pharyngitis, hypopharyngeal cancer and other factors. 1. Chronic pharyngitis: when there is infection in the throat area, such as chronic pharyngitis, there may be exudation of inflammatory substances, which will lead to bitter throat, and may be accompanied by redness, swelling, pain and foreign body sensation in the throat. 2. Reflux pharyngitis: when the stomach content flows back into the throat, damaging the local mucous membrane and causing chronic inflammation, and the inflammatory substances ooze out, the bitter throat will also occur. 3. Hypopharyngeal cancer: when there is tumor in the throat area, such as hypopharyngeal cancer, the local surface of the tumor is broken and oozing, which can lead to bitter throat, and may be accompanied by blood in sputum, difficulty in swallowing, sore throat and other symptoms. Bitter throat with other abnormal manifestations, it is recommended to consult a doctor for detailed examination and treatment to prevent continuous aggravation of the disease.