This is normal because you have injured yourself and the cast is holding the bone or the injury in the place the doctor wants it. It is supposed to be tight around the area but if it is a limb and the fingers or toes are turning purple then you should go to the hospital and have them put a new cast on. The cast prevents you from doing certain things that would require the use of the injured area so this can take a while to adapt to but the cast is usually just uncomfortable in general.... especially when it is hot out or you are exercising.
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