“It’s just gas.” Maybe—but it could also be a sign of something more serious. When persistent gastrointestinal symptoms begin interfering with your daily life, such as interrupting work or sleep, you may need to seek the services of a medical professional trained to diagnose, treat, and prevent such problems. Gastroenterologists specialize in the prevention, diagnosis, and treatment of digestive tract and liver diseases. They also help you plan necessary exams and diagnostic tests to help you stay healthy.