The reasons for stomach pain from drinking yogurt are as follows: 1. Yogurt is too cold: If yogurt is just taken out of the refrigerator, it is easy to stimulate the gastric mucosa and cause stomach pain after drinking. 2. Digestive enzyme deficiency: If you are lactose intolerant, you will have stomach discomfort after drinking milk. 3. Chronic diseases: If patients with gastric ulcers eat yogurt, tyrosine will not be easily digested and will clot in the stomach, leading to increased gastric acid secretion and worsening ulcer symptoms. So patients with gastric ulcer should avoid yogurt intake. If you have stomach pain, it is recommended to have a gastroscopy to find out whether there is organic disease. In daily life, you should eat more warm, soft, light and easily digestible food, avoid the intake of raw, cold, greasy and spicy stimulating food, eat less and more meals, and avoid overeating.