Sometimes hidden pain in the left lower rib cage, but not very strong, can be seen in stomach diseases, costochondritis, intercostal neuralgia, intestinal spasm and so on. 1. Stomach diseases: most of the human stomach is located in the left quarter of the ribs, so if there is chronic gastritis, gastric ulcer and other stomach diseases, the left lower ribs may have symptoms of hidden pain. 2. Costal chondritis: left side costal chondritis can also lead to vague pain in the left lower ribs, aggravated by deep breathing or physical labor. 3. Intercostal neuralgia: Intercostal neuralgia is a symptom of pain in the area innervated by the intercostal nerve. When the intercostal nerve at the left lower rib cage is painful, there will be a vague pain in the left lower rib cage area. 4. Intestinal spasm: Intestinal spasm is abdominal pain caused by strong contraction of the smooth muscle of the intestinal wall, and the pain varies in severity. When the transverse colon has spasm, there may be a vague pain in the left lower ribcage. Left lower ribs sometimes hidden pain but not very strong causes are more, such as long-term hidden pain, it is recommended to hospital specialists, symptomatic treatment, usually light diet, avoid spicy and stimulating food.