Having a hyper reactive nervous system is a common consequence of stress-response hyperstimulation. As stimulation increases, so does the nervous system's sensitivity and reactivity. While this symptom can be bothersome, it's not harmful. But an indication of persistently elevated stress, and often, anxiety.

Why am I so easily startled?

These symptoms can be observed in conditions such as anxiety disorder and stress reactions. Being easily startled would also be accompanied by other signs of stress and anxiety. If you are feeling nervousness or jumpiness that worsens or does not improve, talk with your doctor to determine the cause.

What does it mean if you are very jumpy?

Someone who's jumpy is anxious and jittery. If you've ever been so nervous that you couldn't sit still, you know how it feels to be jumpy. This informal adjective is perfect for describing the sort of anxiety you can't hide.