The knees are complex, hard-working joints. Although they are designed to tolerate some wear and tear, knee pain and injuries can happen to many people. Knee pain has a way of sidelining even the most dedicated athletes.
Knee pain can have many causes, so it's important to note when and where it happens and how it feels. This will help determine what could be causing the issue. If a certain activity triggers knee pain, this can point to a specific problem.
Climbing stairs tends to cause knee pain in many people, but the knees may feel fine at other times.