Nausea and vomiting may be caused by pregnancy and does not require special treatment. Or it may be caused by gastritis, migraine and other diseases, need to take omeprazole, itopride and other medications for the cause of the disease. 1. Pregnancy: In early pregnancy, nausea and vomiting may occur due to endocrine system disorders in the pregnant woman. If it belongs to pregnancy, there is no need to take special treatment, usually with the increase of pregnancy weeks, can be relieved by themselves. 2. Gastritis: Nausea and vomiting are also considered to be caused by gastritis. Patients can take oral proton pump inhibitors, such as omeprazole, lansoprazole, rabeprazole and so on, under the guidance of the doctor. You can also choose to take oral gastrointestinal dynamics drugs, such as itopride, mosapride, etc.. 3. Migraine: Nausea and vomiting may also be caused by migraine. Patients can take oral non-steroidal anti-inflammatory drugs, such as aspirin, ibuprofen and so on. There are many reasons for nausea and vomiting, patients need to identify the cause of the disease and actively cooperate with the doctor to take treatment measures.