The condition exists in two varieties, depending on the direction of movement of the stomach. If the stomach twists around the axis of the digestive tract, the condition is known as torsion, and if the axis of movement is perpedicular to the digestive tract, the condition is known as volvulus. In either case, the oesophagus is closed off, thereby preventing the animal from relieving the condition by belching or vomiting. At the other end of the stomach, the spleen may be damaged if the twisting interrupts its blood supply. If not quickly treated, the condition can lead to blood poisoning, peritonitis and death by toxic shock.