Osteoporosis is a condition where bones become brittle and prone to fractures due to loss of bone density. It is estimated that over 300 million Indians have osteoporosis. Symptoms may not appear until a fracture occurs. Risk factors include age, gender, family history, small frame size, smoking, excessive alcohol, low calcium intake, and medications like corticosteroids. Diagnosis involves a bone density scan, with results given as a T-score. Treatment focuses on lifestyle changes like exercise, calcium and vitamin D supplementation, and bone-boosting drugs. Maintaining bone health throughout life can help prevent osteoporosis and fractures later in life.