Regurgitation, medically known as nausea, refers to discomfort in the upper abdomen and is accompanied by a feeling of nervousness and desire to vomit. Nausea is often a precursor symptom of vomiting and is related to stimulation of the vomiting center in the central nervous system, which usually includes three main types of stimulation sources, as follows: 1. Central stimulation: the stimulation itself is located inside the central nervous system, and most often includes some cranial injuries, such as cranial injuries caused by serious car accidents and cranial infections such as meningitis and encephalitis, or various tumors of the cranium The increase in intracranial pressure can cause nausea and vomiting. In addition, if the central nervous system of the cerebrospinal fluid, the level of toxins can also cause nausea, including foreign toxins, such as the intake of excessive drugs, and pesticides such as suicide intake can cause nausea. In addition, high levels of waste products produced by the body’s own metabolism can also cause vomiting. For example, uremia or ketoacidosis causes a significant increase in the level of urea nitrogen, creatinine and ketone bodies in the cerebrospinal fluid, which can also stimulate the vomiting center to produce vomiting and nausea; 2, peripheral stimulation: the so-called peripheral refers to the various internal organs and the eyes and throat and other parts, if a lesion occurs, the lesion stimulation can be transmitted through the nerve to the vomiting center, so that nausea, vomiting, etc.. Such lesions include various thoracic diseases that are very common in clinical practice, such as pneumonia and even myocardial infarction, which can produce nausea. Abdominal lesions are more common, various inflammatory or obstructive, tumor, vascular lesions, may produce nausea, vomiting, pharyngeal lesions generated by nausea is also very common, the most common is the chronic pharyngitis lesion stimulation caused by nausea, belongs to the peripheral stimulation caused by vomiting; 3, vestibular stimulation: vestibular refers to the inner ear, can regulate the body’s balance function, vestibular The vestibular stimulation is mainly caused by various inflammatory diseases or even tumor lesions. The most common clinical vestibular nausea and vomiting includes motion sickness, also known as motion sickness, motion sickness, seasickness, etc. In addition, Meniere’s syndrome, which is less common in middle-aged women, is also caused by lesions in the inner ear, which is also a vestibular lesion causing nausea and vomiting.