There are many reasons for sudden stomach cramps and vomiting, which may be caused by improper diet, such as excessive consumption of cold, spicy or unclean food, which stimulates the gastrointestinal mucosa and leads to sudden stomach cramps and vomiting. In addition, it may also be caused by various disease factors: 1. Acute gastroenteritis: mostly caused by bacterial or viral infections, mostly in children, people with low immunity or the elderly and infirm, can be transmitted through the fecal-oral transmission route, patients are often accompanied by nausea, vomiting, abdominal pain, diarrhea, fever and other symptoms; 2. Stomach cramps Gastric cramps can be caused by improper diet, unscientific exercise, medication, etc., and manifest as sudden stomach pain, colic, burning sensation, stabbing pain, accompanied by nausea and vomiting, and shock when severe pain occurs; 3, urinary stones: the causes include poor dietary habits, urinary tract infections, metabolic abnormalities, etc., manifest as sudden stomach cramps, severe pain, accompanied by nausea, vomiting and other symptoms, as well as the inability to urinate, blood in the urine. as well as symptoms such as inability to urinate and blood in urine.