If you wake up in the morning with abdominal pain and diarrhea, you usually have problems with gastrointestinal function, such as gastrointestinal dysfunction or acute gastroenteritis.1. Gastrointestinal dysfunction: Cold abdomen, overeating or eating cold and irritating food may cause gastrointestinal dysfunction, resulting in abdominal pain and diarrhea. This type of situation can be observed first, usually relieves itself within 1-2 days after paying attention to keep warm and resume regular diet. If the symptoms persist, consider going to the hospital for further examination for other gastrointestinal diseases; 2. Acute gastroenteritis: if the fishy stool, abdominal pain continues unabated and diarrhea occurs several times a day, it may be caused by unhygienic diet resulting in intestinal bacterial or viral infections, such as E. coli, salmonella, norovirus, etc. Routine stool examination can be done at the hospital and corresponding antibacterial or antiviral treatment can be performed after diagnosis. In addition, pay attention to abdominal warmth when abdominal pain and diarrhea, you can use hot water bags or heat patches to warm the abdomen. Oral probiotics and gastrointestinal tablets can improve gastrointestinal function, and oral montelukast can also be taken to stop diarrhea, while drinking more water to prevent dehydration. If the diarrhea is severe, you can take rehydration salts to ensure electrolyte balance.