Consider the following common scenario. One morning while you are driving to work, you slow down for traffic on I-95 and get rear-ended by the car behind you. Your car is a mangled mess.
At first, you feel fine physically. You even make it into your office and work a full day. You go to be still feeling fine and counting yourself lucky. Then in the middle of the night, you suddenly wake up with shooting pain in your neck and shoulder.
By morning, the pain is so bad that you can barely get out of bed let alone go to work. Your spouse takes you to the local urgent care facility. Nothing is broken, but the doctor says you may have suffered a herniated disc in the car accident. He also says you probably tore your rotator cuff. You spend the next 3 months in and out of various doctor offices undergoing escalating treatment efforts to stop the debilitating pain in your back and shoulder. You end up missing almost 4 months from work and racking up thousands in medical bills.