Bypass surgeries are medical procedures that create a new pathway for blood flow in the body. They are often performed to treat blockages in the coronary arteries, which supply blood to the heart. During the surgery, a surgeon takes a healthy blood vessel from another part of the body and connects it to the artery beyond the blockage, allowing blood to bypass the obstructed area. These surgeries can also be used in other areas, such as the gastrointestinal tract, where they help patients with severe obesity. In these cases, a bypass can reduce the size of the stomach, leading to weight loss and improved health outcomes.