gastrointestinal diseases may cause a range of symptoms. Some common symptoms include: ● Abdominal pain ● Constipation ● Dehydration ● Diarrhea ● Gastrointestinal bleeding ● Heartburn ● Iron deficiency anemia ● Malnutrition ● Nausea or vomiting ● Swallowing problems ● Weight gain or loss for no known reason During your first gastroenterology appointment, your provider will ask about your medical history and symptoms. This will help them diagnose your condition and what tests or treatments may be needed.