Nausea, want to vomit eat some sugar may be low blood sugar, indigestion, atrophic gastritis and other reasons, so eating sugar will be better. 1. Hypoglycemia: not eating for a long time, resulting in lower blood glucose concentration in the blood, causing nausea, vomiting, dizziness and other symptoms, eat sugar to replenish the sugar in the energy blood, so you will feel better. 2. Indigestion: gastric power is insufficient, gastric acid secretion is less, affecting the digestion and absorption of food, eat sugar in moderation, increase the secretion of gastric acid, feel more comfortable. 3. Atrophic gastritis: due to atrophy of the glands of the stomach, the secretion of gastric acid is reduced, leading to a decline in gastric function caused by nausea, want to vomit, eating sugar can promote the secretion of gastric acid to improve the symptoms. There are many causes of vomiting, it is not recommended to rely solely on sugar to relieve, it is recommended to consult a physician under the guidance of standardized medication, in order to avoid delaying the condition.