The cause of any running injury can be the biomechanics of the body, wrong footwear, muscle weakness or an over-working muscle. Just so with the IT band.
IT Band Syndrome: Symptoms and Treatments
Iliotibial Band, Anatomy, Functionality, Runners Knee, Causes
Iliotibial Band Pain in the Runner Part 1: Etiology and Assessment
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IT Band Syndrome - Caddoo Rehabilitation Associates - Waltham , MA
How To Fix IT Band Pain – Squat University