I hurt my arm lifting heavy boxes. my forearm is sore and my hand is tingling. is rest and ice enough for treatment? should i get a brace?

May need more: Rest and brace are ok, but the fact that you have tingling in your hands may mean that their is a nerve involve, i would suggest that you get further evaluation.

May or may not: Try ice and rest as well as brace. After 2 or 3 days use heat and brace. If symptoms do not resolve after 7-10 days then orthopedic and or neurological evaluation is warranted.