I have knee pain while walking, what should i do?

See a doctor.: The first step in helping any problem is to know what the problem is. This symptom could be a mechanical problem, structural problem in the knee, a sign of arthritis, a problem with your foot or ankle, muscle weakness in the quadriceps muscle, or a referred pain from another area. At your age the most likely cause would be a prior injury, quadriceps muscle weakness, or early osteoarthritis.