As for what is fear biologically speaking, when a person experiences fear, certain areas in their brain such as the amygdala and the hypothalamus are immediately activated and appear to control the first physical response to fear.
Kidney Stones Overview. Kidney stones are small pebbles of salt and mineral in the urine. The most common symptom is severe pain. Most stones pass on their own, but medical procedures are used to remove some kidney stones.
Kidney stones, also called renal calculi, are solid pieces of material that form in the kidneys from substances in the urine. Stones can occur in any part of the urinary system from the kidneys to the bladder. They may be small or large. You may have just one stone or many. There are several types of kidney stones, but most stones are calcium stones.