Hidden pain in the left chest after eating a full meal can be caused by angina pectoris, gastric ulcer, left side costochondritis, lung cancer and other diseases. 1. Angina pectoris: the typical symptom of angina pectoris is sudden suffocating and squeezing pain in the left chest of the precordial region, and the pain symptom can be radiated to the left upper limb and other regions, which can be caused after a full meal, leading to the symptom of left chest pain. 2. Gastric ulcer: because the stomach is located in the left side of the chest under the ribs, when suffering from gastric ulcer, the typical symptom is pain after meals, there will be hidden pain in the left chest after eating. 3. Left-sided costochondritis: due to viral infection, chronic strain and other factors, left-sided costochondritis can be caused, with localized swelling and pressure pain, and hidden pain in the left chest after eating. 4. Lung cancer: when lung cancer occurs on the left side, due to the tumor invading the chest wall, it can lead to the symptom of left chest pain, which can be accompanied by cough, hemoptysis and chest tightness. If you have enough left chest pain, you should consult a doctor in time, and the specialist will clarify your condition and then actively carry out appropriate treatment, which will help to alleviate the uncomfortable symptoms as soon as possible.