Chest pain following mva could it be cracked sternum?

Possible.: Most of the time its a muscle sprain. But rib fracture and sternum fracture possible which case pain more severe with each breath and movement. You should get an xray to rule it out.

It is possible: Cracked rib/sternum is common in mva in driver hitting chest on steering wheel or even the air bag, especially if you are older and have thin and brittle bones. Fractures typically cause quite a bit of pain right after trauma. If pain slowly came on 1-2 days after the mva, likely it is strain/contusion rather than fracture. Heart attack can cause this type of pain. Please consult doc. Good luck.