Chest tightness, nausea and vomiting may be related to early pregnancy reaction, indigestion, heatstroke, gastritis, heart disease and so on. 1. Early pregnancy reaction: Early pregnancy reaction is usually nausea, vomiting and accompanied by chest tightness and other symptoms, which is a normal physiological phenomenon, and will be gradually relieved with the time of pregnancy. 2. Indigestion: slow gastrointestinal motility, resulting in the accumulation of food in the stomach and intestines, nausea and vomiting, chest tightness, abdominal distension and other symptoms. 3. Heatstroke: Prolonged exposure to high temperatures prevents the body from radiating heat, resulting in a transient increase in body temperature, leading to disorders in thermoregulation, obvious chest tightness, nausea and vomiting, and in severe cases, dehydration may occur. 4. Gastritis: Gastritis can cause abdominal pain and bloating, nausea and vomiting, chest tightness, acid reflux and other symptoms. 5. Heart disease: Suffering from heart disease, resulting in insufficient blood supply to the heart, is prone to chest tightness and chest pain, which can also be accompanied by nausea and vomiting and other symptoms. It is recommended that patients with symptoms of chest tightness, nausea and vomiting go to the hospital in a timely manner to clarify the cause of the disease and standardize the treatment.