The most common kinds of trauma are PTSD and childhood/domestic abuse. Trauma and its resulting stress can have a lasting impact, and when not dealt with, can cause significant harm to ourselves and others. Learning to recognize, address, and work through these feelings and experiences is the best way to live a productive and happy life.
Physical abuse itself is not the main culprit. Most people have had physical injuries, fractures or burns during childhood due to purely accidental causes and they have not been harmed by it because they have been comforted and cared for by good caregivers at the time of the incident. Damage comes when the injuries are inflicted by those to who one looks for love and protection, and there is no relief from the trauma.