The causes of abdominal pain in the middle of the night are complex and numerous, and the common causes include the following: 1. It may be acute gastroenteritis, especially if you eat unclean food or get cold, which can easily cause abdominal pain, abdominal pain, diarrhea, and dilute watery stools. 2. The patient will experience nausea, vomiting, and even painful symptoms such as urgency, frequency, and urgency. 3, it may be due to cystitis or other female, including the possibility of pelvic inflammatory disease. Therefore, when small abdominal pain occurs, it is best to go to a regular hospital for a detailed examination to find the exact cause and to carry out systematic and standardized treatment according to the cause.