People often think of trauma as having to do just with life and death types of events. While this is the most recognized and studied type of trauma (often called Post-traumatic Stress Disorder), there is also trauma that is relatively less intense, but still causes a lot of worry, rumination, stress, and avoidance of uncomfortable reminders of the past event or situation.
Sometimes people re-experience their past when they felt powerless and had intense needs that were not met or were ignored. This feeling of helplessness and the intense emotions that go along with it can imprint into a type of memory that is more connected with the body and non-verbal unconscious memory. This type of memory tends to last and the reminders keep on coming up unless there is emotional processing to help work it out.