All to often when accidents happen injuries go undiagnosed because one feels like the aches and pains are just normal bumps and bruises that go with the territory. A person can go for a good while not knowing they have an injury that will haunt them the rest of their lives.
Whiplash, for instance, may not present itself for up to 24 hours afterward and if you don't know the symptoms you may not realize until years down the line that the injury exists. "Whiplash" is actually a colloquialism rather than a medical term. It's called so because it describes the action of the neck. Medically speaking it's called cervical acceleration deceleration (CAD).
Whiplash is most often associated with car accidents but can also happen in bicycle accident and falls of many types. The first case was documented in 1919. At the time it was called "railroad spine" because it had been associated with train accidents before the advent of the automobile.
Symptoms may not appear immediately upon the accident, so it's good to pay attention over the first few days for symptoms to appear. These may include neck pain and stiffness, headaches, pain in the shoulder between the shoulder blades, low back pain, pain or numbness in the arm and/or hand, dizziness, ringing in the ears or blurred vision, difficulty concentrating, irritability, sleep disturbances, and fatigue.
Most people recover from these injuries with little intervention other than over-the-counter pain relievers. Some people however, will spend years in chiropractic care and may develop chronic pain. It's best to get a diagnosis early on to treat the injury immediately.