Syncope due to glossopharyngeal neuralgia or other visceral disease: this type of syncope is rare. Transient syncope occurs during lingual-pharyngeal neuralgia, biliary colic, renal colic, bronchial or gastrointestinal endoscopy. It is associated with severe pain and hyperreflexive response of visceral receptors. So, what tests should be done for patients presenting with syncope caused by glossopharyngeal neuralgia or other visceral diseases? The following is a brief introduction: 1. Basic fetoprotein: Basic fetoprotein (BFP) is a fetal protein found in fetal serum and intestinal tissues. It exists in various cancer tissues with a molecular weight of 73 kD. 2. Cerebrospinal fluid glucose and serum glucose ratio: The ratio of glucose in normal cerebrospinal fluid to glucose in blood is constant, which was thought to be due to the blood-brain barrier being permeable to glucose in the past; it was later recognized that this permeability is not simply diffusion, but membrane operation, called carrying operation or carrying diffusion, and the glucose content in cerebrospinal fluid depends on the following The amount of glucose in the cerebrospinal fluid depends on several factors: (1) the concentration of blood glucose; (2) the permeability of the blood-brain barrier; (3) the degree of glucose enzymation in the cerebrospinal fluid; and (4) the function of the carriage system. Serum glucose measurement is one of the most important tests for the diagnosis of diabetes mellitus. All diabetic patients have varying degrees of elevated serum glucose.