Atresia is a medical condition where a body passage or opening is absent or closed. This can occur in various parts of the body, such as the esophagus, intestines, or vagina. Atresia can lead to serious health issues, as it may prevent normal functions like eating or digestion. The condition is often present at birth, known as congenital atresia. Treatment typically involves surgery to create or restore the passage. Early diagnosis and intervention are crucial for improving outcomes and ensuring that affected individuals can lead healthy lives.