Iliotibial Band Syndrome (ITBS) is one of the most common overuse injuries among runners. It occurs when the iliotibial band, the ligament that runs down the outside of the thigh from the hip to the shin, is tight or inflamed. The IT band attaches to the knee and helps stabilize and move the joint. When the IT band isn’t working properly, movement of the knee (and, therefore, running) becomes painful. IT band pain can be severe enough to completely sideline a runner for weeks, or even longer. Make certain that your shoes are not worn, particularly on the outer edges. In addition- It's wise to alter your running patterns such that, you are not constantly inverting one foot more than the other, so change your running path, etc. In some instances-a person may feel extreme discomfort in the hip, as well. In either instance it is wise to use the "R.I.C.E." principle (Rest, Ice, Compression, Elevation.) and stretch the IT band, accordingly. In this instance I recommend a Certified Personal Trainer to assist and guide you through them, properly. If pain persists, it's absolutely without question, time to see a Dr. All the best, Mike, MS. CPT. RM.