If you will faint with stomach pain, consider that it may be related to pain shock, abdominal epilepsy and other factors. 1. Painful shock: the sudden onset of severe abdominal pain will affect the normal physiological function of blood vessels, leading to a sharp decrease in the volume of return blood, which in turn leads to a reduction in the blood supply to the head. Transient ischemia of the brain can lead to sudden fainting. 2. Abdominal epilepsy: Abdominal epilepsy is a type of epilepsy that refers to a sudden loss of consciousness and fainting during a seizure. Reflex abdominal pain is also present during the illness. There may be other clinical reasons for fainting with abdominal pain, so it is recommended to go to the hospital as soon as possible to clarify the cause.