My arm hurts every time i throw down to 2nd? why?

Do you stretch your arm and warm up all the way before you start to throw to the max?That would really contribute to your arm hurting.Just throwing soft in the beginning won't count as a full warm up.If you do stretch and warm up properly then I would recommend going to the doctor.I can't emphasize stretching enough...I've had plenty sore arms because of it.