Patients with allergic purpura may experience symptoms of vomiting. Patients with the gastrointestinal type of allergic purpura may exhibit symptoms such as vomiting, abdominal pain, and diarrhea. The gastrointestinal type is considered a severe form of allergic purpura because it affects critical internal organs and the intestines. In treatment, besides using anti-allergic methods to reduce rashes, it is also necessary to use corticosteroids to reduce inflammation and control gastrointestinal symptoms. Additionally, immunosuppressants such as mycophenolate mofetil can be used to control the gastrointestinal response. Meanwhile, patients should adhere to a strict fasting regimen until symptoms like vomiting and diarrhea improve. (Medication should be administered under the guidance of a professional doctor.)