The reasons for not being able to eat and nausea and vomiting may be pregnancy, gastritis, gastric ulcer and other digestive diseases, encephalitis, increased intracranial pressure and other diseases of the central nervous system, etc., and need to be analyzed specifically. 1. pregnancy: women in pregnancy will produce early pregnancy reaction, affecting the appetite, it will be manifested as inability to eat with nausea, which is caused by estrogen and progesterone disorders. 2. Digestive system diseases: if there is gastritis, gastric ulcer, pyloric obstruction, esophageal cancer, etc., it will affect the peristaltic function of the digestive tract, thus affecting the appetite, and nausea and inability to eat. 3. Central nervous system diseases: if there is motion sickness, encephalitis, elevated intracranial pressure, etc., will reflexively affect the digestive function, resulting in poor appetite with nausea. When the nausea continues to be unrelieved, it is recommended to go to the hospital in time, under the guidance of the doctor for treatment, to promote the alleviation of the condition.