Why You Might Not Feel It Right Away Immediately after an accident, adrenaline and stress hormones flood the body. They help you stay alert and focused — but they also mask pain. Once those chemicals start to settle (usually over the next 24–72 hours), stiffness, soreness, and even headaches can start to show up. This delay is completely normal and part of how your nervous system and immune system respond to injury.

Everyone should get checked by a health professional. Even if injuries seem minor, symptoms like headaches, neck pain, or stiffness often appear later.➡ Tip: Did you know you don't need to see a doctor to have your first assessment? It can sometimes be challenging to see a doctor quickly. In Alberta, you can also see a chiropractor or physiotherapist for your initial assessment — no doctor’s referral required.