Poor diet and eating something unclean usually flares up after 4-6 hours. However, the exact time is related to individual gastrointestinal digestive ability as well as individual circumstances. After eating something unclean it will enter the stomach for digestion and usually after 4 hours the chyme will enter the intestine. Some patients with weak stomach and intestines and poor health, especially elderly patients and young children, may experience abdominal pain, diarrhea, weakness and other uncomfortable symptoms after 4-6 hours. In contrast, some young adults or young people have better gastrointestinal conditions, so the attack may last up to 10 hours or even no attack. Unclean food spoilage may breed bacteria, viruses and worm eggs, causing gastrointestinal flora imbalance, so symptoms may appear in a short period of time after one excessive consumption. It is recommended to pay attention to a healthy diet, wash hands regularly before and after meals, and avoid eating expired and spoiled food.