There are many reasons for chest tightness, dizziness and nausea in patients, which may be caused by serious diseases, or may be caused by exertion and poor rest. 1. If the degree of chest tightness, dizziness and nausea in patients is mild, which occurs under exertion, poor rest, overnight or staying up late, it is recommended that patients ensure good rest and observe changes in their condition. 2. If the symptoms of chest tightness are heavy, they may be caused by serious heart diseases, such as patients with malignant arrhythmias that cause the heart’s blood ejection to be affected, causing the symptoms of chest tightness, dizziness and nausea when the blood supply to the brain is insufficient. Symptoms of chest tightness, dizziness, and nausea may also occur when the patient’s cerebral blood vessels are in spasm. In this case, it is necessary to promptly consult a hospital to improve transcranial Doppler, electrocardiogram and cardiac enzyme examination to clarify the cause and then carry out symptomatic treatment.