Vomiting yellow bitter water may be the patient suffers from acute gastroenteritis, acute cholecystitis and other diseases caused by, if it is appeared in women, may be early pregnancy reaction. 1. Acute gastroenteritis: patients who have recently consumed unclean food or spicy, cold stimulating food may lead to acute gastroenteritis, the main symptoms of which are abdominal pain, diarrhea, vomiting, etc. At this time, if you vomit violently, you will vomit yellow bitter water. 2. Acute cholecystitis: patients mostly due to gallstones lead to bile stasis, and then complicated by bacterial infection, its main clinical manifestations for the epigastric pain, abdominal distension, nausea, vomiting and other symptoms of vomiting intensified vomiting may appear to vomit yellow bitter water. 3. early pregnancy reaction: women in the early stages of pregnancy, due to the body’s hormone levels gradually rise, will cause nausea, vomiting, commonly known as pregnancy vomiting, if pregnancy vomiting reaction is serious, will vomit yellow bitter water. Spitting yellow bitter water may also be caused by other reasons, it is recommended that patients go to the hospital as soon as possible to find out the cause of the disease, under the guidance of the doctor, targeted treatment.