The old gas coming up from the throat is considered to be caused by reflux pharyngitis, gas accumulation in the stomach or indigestion. 1. Reflux pharyngitis: when the lower esophageal sphincter relaxes, gastric juice and stomach contents may reflux into the throat, causing inflammation of the throat. Patients often have a foreign body sensation in the throat, sore throat, belching and other manifestations, so it can be seen that there is always gas up the throat. 2. Accumulation of gas in the stomach: some patients may produce more gas volume in the stomach after eating food that is easy to produce gas. When the stomach is squeezed or the position is changed, the gas in the stomach may come out upward, so it can be seen that there is always gas coming out of the throat. 3. indigestion: when the patient has peptic ulcer, chronic gastroenteritis and other diseases affect the function of the gastrointestinal tract, can make the gastrointestinal peristalsis, emptying and other functions are affected, and then the gastrointestinal contraction is excessive or contraction rule is destroyed, often manifested as belching, nausea, vomiting, loss of appetite and other manifestations, so it can be seen that there is always a breath in the throat up the situation. When you have a throat with gas coming up, it is recommended that you consult a hospital as soon as possible to find out the cause and then actively treat it.