The simple answer to this question is ‘yes.’
Suppose you’ve been rear-ended by another driver. You both exchange insurance information, but when you file a claim for the damage to your bumper, you discover that the other driver hired a lawyer who claims that you slammed on your brakes and caused the collision. Without a lawyer of your own, it’s difficult to fight against these accusations and prove that the other driver is at fault.
Consider another scenario: You get in a minor accident, but everything seems fine. Your neck is sore, and you’re a little dizzy, but you think you’re just a little shaken up from the fender-bender and determine that it’ll go away with time. You still aren’t feeling better a week later, so you visit the doctor and discover that you have whiplash.
In this scenario, a lawyer can often prove causation between your injury and the car accident. You may not have been able to do this on your own since you neglected to see a doctor immediately following the accident.