Nausea and vomiting after being hungry can be caused by certain substances, low blood sugar, low blood pressure, digestive diseases, etc. Treatment needs to be based on the different causes of nausea and vomiting. Common causes and treatments 1, certain substances stimulation: tobacco and alcohol, as well as coffee, strong tea and other factors stimulation, there will be nausea after hunger, want to vomit symptoms. Lifestyle adjustments can be made to quit smoking, alcohol, avoid drinking strong tea and coffee, appropriate physical exercise, and maintain a good psychological state to improve the symptoms; 2, hypoglycemia: prolonged starvation may appear hypoglycemia, manifested as nausea, vomiting, palpitations, sweating, hand tremors and so on. Should eat in time, if the situation is more serious, hypoglycemic coma, should be immediately sent to the hospital, given intravenous glucose solution; 3, low blood pressure: acute hypotension will appear dizziness, nausea, blurred vision and other symptoms, low blood pressure symptoms are not obvious, can be improved by changing the diet and lifestyle, the symptoms are obvious or blood pressure suddenly lowered, the need for timely treatment, such as assisting the patient to lie flat and so on. In addition, consult a doctor as soon as possible to clarify the cause, to be treated accordingly, such as giving rehydration, blood pressure medication, etc.; 4, digestive diseases: suffering from gastric ulcers, acute and chronic gastritis, duodenitis, duodenal ulcer and other diseases, in the fasting state is prone to upper abdominal discomfort, including pain, nausea, want to vomit symptoms. It is recommended to consume alkaline food, such as soda crackers, or take oral inhibition of gastric acid, gastric mucosa protection drug aluminum hydroxide gel to relieve symptoms. If the symptoms continue to be unrelieved, seek medical attention. Improve your dietary habits, eat regularly, eat small and frequent meals, eat a light and easily digestible diet, and avoid spicy and greasy foods, such as hot pot and fatty meats. If discomfort occurs, seek medical treatment promptly to avoid delaying the condition.