There are many reasons for nausea and vomiting after intercourse, which may be due to gastrointestinal diseases, but also to psychological factors, pregnancy, and dietary factors. If the symptoms are not serious, usually no treatment is needed. If nausea and vomiting occur after each intercourse, it is recommended to actively seek medical attention to identify the cause. The specific causes and treatment methods are as follows: 1, pregnancy: If you are pregnant but do not know, you may have nausea, vomiting and other pregnancy reactions after intercourse, you need to use the early pregnancy test paper first, if two bars, you need to go to the obstetrics department for examination; 2, gastrointestinal diseases: If you suffer from gastrointestinal diseases, you will be stimulated to have muscle spasms in the gastrointestinal tract due to excitement during intercourse, and you will experience nausea and vomiting. Nausea, vomiting symptoms, can take drugs to relieve the discomfort symptoms. But if the patient vomiting, diarrhea symptoms are more serious, you need to seek medical attention in time to prevent dehydration; 3, psychological factors: if the sexual partner or sex from the heart on the aversion, aversion, may be in the same room after the symptoms of nausea, want to vomit, which is due to psychological factors, usually need to be psychological intervention. Some people in the sexual life because of excessive emotional excitement, resulting in the whole body vascular and muscle contraction spasm, when the gastrointestinal muscle spasm will appear nausea, want to vomit. Generally pay attention to rest can be, daily exercise more physical; 4, dietary factors: If you eat too much raw, cold, greasy, spicy stimulating food before intercourse, may be in the intercourse after strenuous exercise gastrointestinal discomfort symptoms, at this time can be appropriate to eat yogurt or stomach stomach dissipation tablets to promote digestion; 5, semen allergy: patients after intercourse appear perineal edema, strange itching, nasal congestion, sneezing and other symptoms, in serious cases can nausea, vomiting, dizziness and headache. It is recommended to use condoms for contraception, and women can take prophylactic oral anti-allergy drugs such as chlorpheniramine maleate tablets and loratadine tablets half an hour before intercourse.