The left side of the belly button often hidden pain but normal stools, may be functional indigestion, chronic gastritis, women’s left adnexitis, left ureteritis and other reasons. 1. Functional dyspepsia: stomach peristalsis is relatively slow, the secretion of digestive juices is insufficient to affect the emptying of food, so the left side of the navel pain, bad breath, loss of appetite, constipation and other symptoms. 2. Chronic gastritis: such as superficial gastritis, erosive gastritis, etc., because the gastric mucosa has inflammation, gastric acid secretion stimulates the gastric mucosa caused by abdominal pain, can also be manifested in the left side of the navel pain, accompanied by acid reflux, nausea, abdominal distension and other symptoms. 3. Adnexitis on the left side of women: due to inflammatory factors stimulating the left adnexa, resulting in frequent hidden pain on the left side of the navel. 4. Left ureteritis: Inflammation of the left ureter can cause frequent pain on the left side of the navel, usually in the lower abdomen, accompanied by frequent urination, urinary urgency and other symptoms. It is recommended to consult a doctor in time to identify the cause of the disease as soon as possible to the cause of standardized diagnosis and treatment.