This will depend on the statute of limitations in your state. A personal injury case may need to be filed within a year of the accident, or you may have as much as four years to file. You should check the rule in your state to make sure that you do not accidentally waive your rights. There are some exceptions to the statute of limitations, but they are very narrow, so you should not assume that an exception applies. As a practical matter, moreover, you should try to pursue a claim as soon as possible while the evidence is still fresh. This will help you prove liability and the scope of your damages.
You may still have a case even if you do not feel hurt at the scene. The biological response to a traumatic situation like an accident sends a rush of adrenaline through the body, which can temporarily reduce sensations of pain. You may start feeling significant pain or developing other symptoms later. It is wise to consult a doctor even if you do not feel immediate, excruciating pain, since some of the most serious conditions emerge over time.
You do not need to make this decision on your own. Contact me and set up a free consultation to go over your situation in detail. The attorney will be able to tell you whom you can sue and what you can expect to recover, based on the facts of the accident and the laws in your state. Essentially, in most situations, you will have a case if someone acted carelessly under the circumstances and caused your injuries. Applying this standard is more complicated than it sounds, however, which is why it is important to consult an attorney.
If you have been injured in an accident, the most important priority is getting medical attention. Assuming that you are not taken to the emergency room immediately, you should take photos or videos of the accident scene and get the contact information of any witnesses. You should not admit fault or apologize to anyone else who was involved, even if it seems like a polite thing to do. Anything that you say in the aftermath of an accident can be used against you if you pursue a claim or lawsuit later. If you suspect that someone else may have been at fault, you should set up a consultation with an attorney to discuss your options. The first consultation is almost always free.