Left chest rib pain is mostly caused by chest wall lesions, may also be the left thoracic organs (such as heart, lungs, etc.) lesions, the patient consciously for rib pain, it is recommended to consult a doctor in time. 1. Chest wall lesions: such as left rib contusion, fracture, costochondritis, pectoral muscle strain, etc., the pain can be aggravated during thoracic activities (such as lifting the arm, deep inhalation, etc.), and there is obvious pressure pain at the site of the lesion. 2. Lung lesions: such as pneumonia, tuberculosis, lung cancer, etc. on the left side of the lungs, the chest wall is mostly without pressure pain, and the patient may also be accompanied by coughing, coughing up sputum, coughing up blood, dyspnea and other uncomfortable symptoms. 3. Heart disease: such as coronary heart disease, myocarditis, pericarditis, etc., the pain is usually located in the anterior region of the heart, mostly triggered by physical activity, and may be accompanied by fever, palpitations, chest tightness, fatigue and other discomforts. Patients with symptoms of left chest rib pain, persistent unrelieved or accompanied by other discomforts, should promptly consult a doctor to improve the relevant examinations, such as X-ray, CT, blood routine, myocardial enzymes, electrocardiogram, echocardiogram, etc., so as to clarify the diagnosis of the disease, and comply with the doctor’s instructions to carry out the appropriate treatment.