It’s a common problem amongst runners.
ITB related pain can be due to tightness, a busitis, snapping or flicking of the band. Often symptoms develop after you have been running for a certain distance.
As Dr a Paul suggests, it would be worth being assessed, together with an ultrasound scan to look for a bursa or a gait analysis to check whether your running pattern might be contributing. In some patients, modifying this is all that is required, whereas for others, they might require a guided treatment.
I hope this helps.
Bw
Dr Dinesh