The presence of discoid meniscus found at the age of 30 is not a serious condition in itself, but due to the high risk of meniscus injury, it is recommended to prevent structural damage by strengthening knee stability through proper exercise. Discoid meniscus is a condition in which the meniscus of the knee joint develops abnormally at birth. As the cruciate ligament develops, the meniscus divides from a complete disk of cartilage into inner and outer sides. Normally, the center portion of the meniscus is resorbed at birth, but if it is not, an oval disc-shaped deformity, known as a discoid meniscus, occurs. Because the discoid meniscus has a small contact area with the femoral condyles, the meniscus is prone to rupture from minor trauma and is at a higher risk of injury. Discoid meniscus usually does not show clinical symptoms by itself. It is recommended to take appropriate exercises in daily life, such as leg raising and squatting, to strengthen the quadriceps muscles and enhance the stability of the knee joint, which can help to prevent structural injuries. If you experience discomfort in the knee, it is recommended that you seek medical attention in a timely manner to identify the cause of the problem and standardize treatment under the guidance of your doctor.