Roux-en-Y Gastric Bypass (RYGB) is a popular form of bariatric surgery that reduces the size of the stomach and reroutes the digestive system. This results in both restriction of food intake and malabsorption, leading to significant weight loss. The surgery is considered highly effective for morbidly obese individuals and also helps improve obesity-related health issues like diabetes, hypertension, and sleep apnea. However, it requires lifelong dietary changes and nutritional supplements to avoid deficiencies.

Gastric banding is a type of bariatric surgery in which an adjustable band is placed around the upper part of the stomach to create a small pouch that limits food intake. It is one of the least invasive forms of weight-loss surgery but has fallen out of favor due to its lower success rates compared to other procedures like the sleeve gastrectomy or Roux-en-Y bypass. The band can be adjusted or removed, making it more flexible than other surgeries.

Gastritis can sometimes cause referred pain that radiates to the back, although this is not a common symptom. If a patient experiences back pain along with gastritis symptoms like nausea, bloating, or indigestion, it could indicate a more severe condition or complications such as ulcers.

This is another term for the Roux-en-Y gastric bypass surgery, where the stomach is divided into a small pouch and a large "remnant," with the small intestine rerouted to connect to both. It is a more complex surgery compared to other weight-loss procedures but has a high success rate in achieving long-term weight loss.