There are many causes of left upper rib pain, such as rib lesions, respiratory disease, heart disease, etc. 1. Rib lesions: intercostal neuralgia, costochondritis and other diseases, can cause the phenomenon of left upper rib pain, mainly paroxysmal pain, usually after resting the symptoms will be relieved. 2. Respiratory diseases: lung occupational disease, pulmonary herpes rupture, acute and chronic bronchitis, spontaneous pneumothorax and other diseases, can also lead to the phenomenon of hidden pain in the left upper rib. 3. Heart disease: angina pectoris, cardiac infarction, myocardial ischemia, etc., can also lead to the phenomenon of hidden pain in the left upper ribs, mainly pinprick pain, squeezing pain, accompanied by dyspnea, chest tightness and shortness of breath. There are many other causes of left upper rib pain, such as digestive system diseases, pleurisy, etc. After the symptoms, we suggest that we go to the hospital in time to improve the examination, and take standardized treatment according to the doctor’s instructions, and do not ignore the symptoms and take them lightly.