Belching (hiccups) usually does not cause pain in the left posterior lumbar region. Usually, belching may be caused by physiological factors such as swallowing too much air, overeating, or other causes such as chronic gastritis, indigestion, etc., while left posterior lumbar pain may be caused by kidney stones, lumbar strain, and other factors such as lumbar intervertebral disc herniation. 1. Belching: (1) Physiological factors: if eating too fast or open-mouth speech may lead to belching, which is a normal physiological phenomenon. (2) Chronic gastritis: Chronic gastritis may be caused by Helicobacter pylori infection, excessive alcohol consumption and so on. Patients will not only have belching, but also abdominal pain, bloating, nausea and other manifestations. (3) dyspepsia: dyspepsia may be caused by gastrointestinal dyskinesia. In addition to belching, the patient will also show postprandial fullness and bloating, middle and upper abdominal pain and so on. (4) Other: Belching may also be caused by reflux esophagitis, gastric ulcer and other diseases. 2. Left back pain: (1) Kidney stones: Kidney stones are considered to be caused by metabolic abnormalities and urinary tract obstruction. If the patient has kidney stones in the left side of the waist, it will not only manifest as left back pain, but also have symptoms such as hematuria and stone discharge. (2) Lumbar muscle strain: Lumbar muscle strain may be caused by chronic injury and other reasons. Patients may have left posterior back pain, lumbosacral pain and other manifestations. (3) Others: patients with left posterior back pain may also be caused by lumbar disc herniation, pancreatitis and so on. For the exclusion of physiological factors causing belching, patients appearing belching or left posterior back pain need to consult a doctor in time and follow the doctor’s instructions for treatment.