For Shivers up My Spine?

: to make someone feel very thrilled, frightened, etc. Her thrilling performance sent a chill up my spine. The very thought of encountering those people in a dark alley sends a shiver down my spine.

What causes a shiver up your spine?

A shiver is caused by your muscles tightening and relaxing in rapid succession. This involuntary muscle movement is your body's natural response to getting colder and trying to warm up.

What is it called when you get a shiver up your spine?

During a frisson, a sensation of chills or tingling is felt on the skin of the lower back, shoulders, neck, and/or arms. The sensation of chills is sometimes experienced as a series of 'waves' moving up the back in rapid succession and commonly described as "shivers up the spine".