Sometimes there is a vague sense of pressure on the left chest may be physiological reasons, pathological reasons such as pleural effusion caused by the adverse symptoms, suffering from coronary heart disease, pneumonia and other diseases will also appear this kind of discomfort, you need to consult a doctor in time for examination. 1. Physiological causes: In addition, the left chest sometimes has a vague sense of pressure, may also be overwork caused by the discomfort, usually through timely rest and adjustment will be relieved. 2. Pleural effusion: pleural effusion may cause the left chest sometimes have a vague sense of pressure, the patient may appear chest tightness, shortness of breath and other undesirable symptoms, after strenuous exercise there will be obvious shortness of breath, may also cause dyspnea, part of the patient’s chest will appear pain. 3. Coronary heart disease: the left chest sometimes has a vague sense of pressure is common in coronary heart disease, usually accompanied by varying degrees of pain, the patient will also appear palpitations, chest tightness, shortness of breath and other adverse symptoms, emotional over-excitement or over-exertion, the symptoms will be more pronounced, and may lead to shock in severe cases. 4. Pneumonia: sometimes there is a vague sense of pressure on the left chest, may also be the discomfort caused by pneumonia, the patient will cough, cough sputum and other adverse symptoms, will be accompanied by fever, will lead to the body to appear cold, fatigue and other discomforts. When such symptoms occur, it is recommended to consult a doctor in time for relevant examinations, and choose the appropriate treatment under the guidance of the doctor’s advice.