Pain below the rib cage on the left side of the cough may be caused by respiratory disease, heart disease, and pleurisy, and the patient should seek medical attention. 1. Respiratory system diseases: such as pneumonia and tuberculosis. (1) Pneumonia: Inflammation of the alveoli, distal airways and interstitium of the lungs due to bacterial, viral and other infections, the patient will have fever, cough, fatigue, pain below the left rib cage, etc., and can be treated with penicillin, erythromycin and other drugs as prescribed by the doctor. (2) Tuberculosis: Mycobacterium tuberculosis infection of the lungs caused by an infectious disease, mostly in the resistance of the population is relatively poor, the patient will have a low-grade fever, night sweats, coughing, pain in the left side of the lower ribs and other symptoms, can be prescribed by the use of isoniazid, rifampicin, pyrazinamide, etc. for treatment. 2. Heart disease: the heart disease that can cause cough and left-sided pain under the ribs is coronary heart disease, mostly seen in middle-aged and elderly people around 50 years old, more men than women, such people will also have chest tightness after physical labor, chest squeezing pain, etc., you can follow the doctor’s advice to use nitroglycerin, isonitrate sorbate, etc. for treatment. 3. pleurisy: pleural infection caused by pathogenic bacteria, the patient will have chest tightness, chest pain, coughing, and in severe cases there may be dyspnea, can use penicillin, metronidazole and other drugs for treatment. If coughing left below the rib cage pain, should promptly seek medical attention, clear cause of the symptomatic treatment, the drug should be used in strict accordance with the doctor’s instructions, do not self-diagnosis and medication.