Many victims in car and truck accidents reinjure parts of their bodies that have been hurt previously. The inevitable question is whether or not they should disclose the preexisting problems to the insurance companies, their doctors and their lawyers?
The answer is an emphatic "Yes"! Insurance companies have access to a database which purports to reflect all prior injury claims, so once they get your date of birth and name they know quickly whether or not you have been hurt before, what part of you was injured, how it was injured, who the insurance company was and how much was paid.
For doctors, effective treatment requires knowledge of your past medical history both to treat and to ensure that their medical reports are credible.
As for your lawyer, they must know the truth about everything and most particularly about prior claims and injuries in order to maximize your fair compensation.