Mild nausea without vomiting in women can be caused by many diseases, such as early pregnancy, heat stroke, chronic gastritis and so on. 1. Early pregnancy: After pregnancy, due to elevated levels of human chorionic gonadotropin, women may experience nausea, vomiting, drowsiness and other early pregnancy reactions, but there are individual differences in severity, and some women may only experience mild nausea without vomiting. 2. Heatstroke: women exposed to hot weather or environment for a long time, the body heat can not be distributed in a timely manner, can lead to heatstroke, the patient may appear nausea, vomiting, fatigue, dizziness and other manifestations, some of the patients exposed to a short period of time, the condition of the disease is less severe, can be manifested as a slight nausea without vomiting. 3. Chronic gastritis: it is a non-specific inflammatory disease of the gastric mucosa, which can lead to a decline in gastric function, and patients can suffer from indigestion, bloating, nausea, vomiting and other manifestations, and some patients can show slight nausea without vomiting. In addition to the above reasons, there are many other possible causes, patients should seek timely medical treatment as soon as possible, so as not to delay the condition leading to adverse consequences.