Gallstones are a common side effect after Roux-en-Y gastric bypass surgery—caused by rapid weight loss and bile changes. This guide explains what gallstones are, why bariatric patients are at higher risk, when they typically develop, and the symptoms you should never ignore. Learn how to prevent gallstones with medication, diet, and surgical timing. Discover diagnosis methods like ultrasound, treatment options including gallbladder removal, and when to seek urgent care. Designed for both pre-op and post-op patients, this article answers your most important questions about gallstones and your weight loss journey.