GI tract, together with our liver, pancreas, and gallbladder, make up our digestive system. An extensive network of blood vessels supply blood to these organs and also transports nutrients away to other organs in the body. Nerves and hormones work together to regulate the functioning of the digestive system and bacteria that reside within our GI tract (called our gut flora or microbiome) play a role in digestion, immunity, and our overall health. A membranous sac called the peritoneum holds all the digestive system organs in place.A number of different conditions or diseases can affect the GI tract and have an impact on digestion and/or our overall health. Some conditions have similar symptoms, and further medical investigations may be required before a doctor arrives at a diagnosis. Common gastrointestinal disorders