Weight loss surgery, or bariatric surgery, helps individuals with severe obesity lose weight by altering the digestive system. Conditions like type 2 diabetes, hypertension, and sleep apnea often accompany obesity. Symptoms of obesity include excessive weight gain, fatigue, joint pain, and difficulty breathing. Surgery is considered when diet and exercise fail. Common procedures include gastric bypass, sleeve gastrectomy, and adjustable gastric banding, which reduce stomach size or alter digestion to limit food intake and absorption. Patients may experience rapid weight loss, improved comorbidities, and better quality of life. However, risks include nutritional deficiencies and complications like infections. Post-surgery, patients must follow a strict diet, exercise, and regular follow-ups. Long-term success depends on lifestyle changes. Surgery is typically recommended for those with a BMI over 40 or 35 with obesity-related health issues.