Stomach cramps, diarrhea, and fever are symptoms of intestinal infections, and common causes of infection are bacteria and viruses. You should try to eat fresh food in your diet and avoid food that has rotted and spoiled, which will carry some bacteria that will overpopulate the digestive system when they enter the system, and even lead to an imbalance of intestinal flora in the gastrointestinal system. Imbalance of intestinal flora will affect the function of the intestinal tract, not only can’t absorb the nutrients and water in the food, but also cause the intestinal tract to have localized spasms, and a lot of patients will show stomach pain and diarrhea as a result. People with low immunity will be more susceptible to viral infections after exposure to viruses, and the intestinal system, after being infected by viruses, will induce faster peristalsis, accelerating the discharge of intestinal contents out of the body and abdominal pain, diarrhea phenomenon. The intestinal tract, due to bacterial or viral infection, will affect the body’s white blood cells, and the body will also experience fever.