A meniscus injury occurs when the meniscus, a C-shaped cartilage in the knee, is torn or damaged. This injury often happens during activities that involve twisting or turning the knee, such as sports. Symptoms may include pain, swelling, and difficulty moving the knee. Treatment for a meniscus injury can vary based on the severity. Mild injuries may heal with rest, ice, and physical therapy, while more severe cases might require surgery to repair the torn cartilage. Early diagnosis and appropriate care are essential for a full recovery and to prevent further knee problems.