No, you can get treatment (chiropractor, physical therapy, hospital) whenever you want to following an auto accident in Massachusetts. But, it is wise to get treatment as soon as the pain, soreness and tightness (common symptoms of sprains and strains) begins. The main reason you should not wait is your body needs medical attention as soon as possible following the physical trauma of a car accident. The other reason it is important not to delay treatment is the insurance adjuster is going to claim that since you waited to receive treatment, you really could not have been injured in the accident.