Knee pain can occur due to multiple reasons. It usually results from overuse, poor form during physical activity, not warming up or not cooling down, or not enough stretching. Injuries are the most common cause of knee problems. Sudden (acute) damage may develop after a direct blow to the knee or from abnormal twisting, bending of the knee, or falling on the knee. On the other hand, repetitive activities or repeated, prolonged pressure on the knee can cause overuse injuries. Activities such as stair climbing, bicycle riding, jogging, or jumping, can stress the joints and other tissues, and lead to irritation and inflammation. Other problems not directly related to an injury or overuse may occur in or around the knee.
Treatment for a knee problem or injury may include first aid measures, rest, bracing, physical therapy, medication, and in some cases, surgery. The location, type, and severity of the injury as well as your age, health condition, and activity level (such as work, sports, or hobbies) will influence the treatment you need.
If you have flat feet and your knee pain is caused by a physical activity or overuse, you can try special shoe inserts and arch supports (orthotics).A shoe insert can help correct excessive pronation (turning your foot inward when you walk) which sometimes causes knee pain.