Yes, it is possible to file a car accident lawsuit even if you did not receive medical treatment after the accident. However, not receiving medical treatment may make it more difficult to prove that you were injured in the accident and to establish the full extent of your injuries. In a car accident lawsuit, the injured party (the plaintiff) must prove that the other party (the defendant) was at fault for the accident and that the accident caused the plaintiff's injuries. Without medical records and other evidence of your injuries, it may be more difficult to establish these elements of your case. It's important to note that every case is different, and the specific factors that will affect your ability to file a successful car accident lawsuit will depend on the circumstances of your case.