The pitch of one's voice is raised by increasing the muscle tension on the vocal folds in the larynx.
Those of us who couldn't afford a guitar have probably had an equivalent experience by progressively stretching and plucking a rubber band which we held at one end between our teeth.
We would hear a definite increase in the pitch of the resulting "twang" sound, usually for several strums before we felt the excruciating pain of the rubber band as it broke and snapped back.
Then, of course, you would hear the high pitch of someone yelling.
We achieve a high vocal pitch, incidentally, by tightening the muscles associated with the vocal folds to increase their tension, much in the same fashion that we pull back on the reins of a horse.
Some people who live in the "fast lane" find through life a constant need to be on the "red alert". These individuals are often described as "High Strung."