Nausea and vomiting after menstruation may be caused by emotional stress, poor diet, autoimmune gastritis and other factors. 1. Emotional tension: When a person is emotionally stressed, he or she may experience nausea and vomiting. Women may have physical discomfort during menstruation, and this discomfort is a blow to the organism, which may lead to emotional tension during menstruation, and this tension may continue beyond the end of menstruation. Therefore, nausea and vomiting after menstruation may be caused by emotional tension. 2. Improper diet: If you eat a lot of greasy and indigestible food after menstruation, such as fried chicken, fatty meat, pork chop soup, etc., it may lead to indigestion, so that the food accumulates in the gastrointestinal tract, thus the symptoms of nausea and vomiting after menstruation. 3. Autoimmune gastritis: When autoimmune gastritis occurs, the body may produce antibodies that attack the mural cells, causing a decrease in hydrogen ion secretion. The decrease in hydrogen ion secretion may lead to a decrease in the acidity of the gastric juice, which may cause indigestion, resulting in nausea and vomiting after menstruation. When nausea and vomiting after menstruation occurs, you should consult a doctor, and under the doctor’s guidance, complete the psychological intelligence test, physical examination, serum antibody test and other tests to clarify the cause of the disease and actively treat it.