The presence of chest tightness, shortness of breath, fatigue and drowsiness should be considered as cardiac diseases, respiratory diseases and electrolyte disorders. 1. Diseases of cardiac origin: such as acute myocarditis, heart valve disease, high heart disease, unstable angina and chronic heart failure. All of the above diseases can cause ischemia and hypoxia of coronary artery, which will cause patients to have chest tightness, shortness of breath, fatigue and drowsiness. 2. Respiratory diseases: such as chronic obstructive pulmonary disease, pulmonary hypertension, etc., which can cause a decrease in blood oxygen saturation and low partial pressure of oxygen, resulting in chest tightness, shortness of breath, fatigue and drowsiness. 3. Electrolyte disorders: hypokalemia, hyponatremia and other diseases will be manifested as weakness, drowsiness and chest tightness. It is recommended that the patient actively consult the doctor and follow the doctor’s instructions for treatment.