The left side of the ribs when eating pain can be seen in the normal people who eat more, but also can be seen in intercostal neuralgia, costochondritis and other diseases, the patient should consult a doctor in time. 1. Physiological conditions: normal people who eat a lot of food, may be caused by the left side of the rib swelling and pain, such people should pay attention to do not eat too much food, usually without special treatment. 2. Intercostal neuralgia: the intercostal nerve damage caused by a variety of causes of its innervating region of the strip pain, which can be manifested as the left side of the ribs inside the distension, eating, coughing, deep breathing will be aggravated, you can use carbamazepine, pregabalin and other drugs for treatment. 3. Costochondritis: If the left side of the rib cage is swollen and painful when the patient eats, which occurs in the front chest, it may be caused by costochondritis, and the patient will have localized distension and swelling, and the pain will be aggravated when eating, which can be treated with drugs such as ibuprofen. All of the above medications should be used under a doctor’s supervision.