Nausea lying down may be caused by gastric insufficiency, cervical spondylosis, arrhythmia and other reasons. 1. Gastric insufficiency: lying on the nausea may be due to the position of the stomach is compressed resulting in gastrointestinal dysfunction gastric insufficiency, the patient’s gastrointestinal tract is difficult to excrete the accumulation of excessive impurities, there will be lying on the nausea, abdominal distension, vomiting and other symptoms. 2. Cervical spondylosis: patients with nausea lying down may also be related to cervical spondylosis, mainly related to work or posture is not correct, often look down at the phone or sleep on the stomach caused by cervical spine pressure, resulting in cervical nerve compression, triggering nausea lying down symptoms. 3. Arrhythmia: prolonged lying down may compress the heart triggering arrhythmia, high degree of atrioventricular block, the heart beats at an irregular frequency, the patient will have symptoms of insufficient blood supply to the brain, accompanied by other organs with insufficient perfusion, which leads to the patient to appear lying down dizziness and nausea symptoms. If the patient appears lying down nausea, it is recommended to seek timely medical treatment, under the guidance of the doctor, to take the appropriate treatment program.