Itchy throat and cough after lying down, consider allergic pharyngitis, postnasal drip syndrome, gastroesophageal reflux disease, etc., should be based on the specific cause of the disease, choose the general treatment or medication and so on. 1. Allergic pharyngitis: it often occurs after contact with allergens. If you have an itchy throat and dry cough at night when you sleep, you may be stimulated by cold air and dust to induce allergic pharyngitis. The indoor environment should be improved, or the use of anti-allergy medication, such as loratadine and other cough suppressants. 2. Postnasal drip syndrome: After lying down, inflammatory secretions from the nasal cavity or sinuses flow into the oropharynx through the posterior nostrils, which may induce an itchy throat and irritating dry cough. Treatment should be directed at the cause of the disease. If non-allergic rhinitis exists, decongestants, such as ephedrine nasal drops, can be used; if allergic rhinitis exists, inhaled glucocorticoids, such as budesonide, are preferred. 3. Gastroesophageal reflux disease (GERD): If GERD exists, it can be induced after lying down, and the long-term stimulation of gastric acid and gastric contents can cause itchy throat and irritating dry cough. Acid inhibiting drugs, such as omeprazole, can be used, along with gastric stimulating drugs, such as domperidone and other treatments. There are other possibilities for the manifestation of itchy throat and cough after lying down, you should go to the hospital in time and be treated under the guidance of the doctor.