Gastritis does not usually cause back bloating. Gastritis is categorized into acute gastritis and chronic gastritis, which mainly causes discomfort in the digestive tract area. The main symptoms of acute gastritis are pain in the upper abdomen, bloating, nausea, vomiting, loss of appetite, and in severe cases, vomiting blood. Most of the chronic gastritis has no obvious symptoms, and those who have symptoms mainly have epigastric fullness, dull pain, burning pain, loss of appetite, acid reflux, nausea and so on, but generally do not cause waist distension. If you are suffering from lumbar distension, you should consider that it is due to coldness in the lumbar area, poor rest, or lumbar muscle strain, etc. In addition, it may also be due to renal diseases, such as pyelonephrosis, glomerulonephritis, etc. You should go to the hospital for a detailed examination, and then treat the cause of the disease according to the symptomatic treatment. Gastritis, usually pay attention to the diet of light and mild, do not eat cold and irritating food, do not drink alcohol or strong tea, coffee, etc..