My shins hurt all the time like a shin splint feel but worse and only after excersize I've had xrays and blood work but nothing looked bad. What's up?

Leg pain. You have the classical characteristic of what is called exertional comparmental syndrome, and usually due to the increasecomparmental pressure of the leg during exercise.The diagnosis is made by measurments of the comparment pressure during exercise.Blood test, x-ray are negatives.