Final answer:
Kidney stones are solid crystals that can block the flow of urine out of the body. They cause symptoms such as severe pain and blood in the urine. Commonly associated with colicky pain and hematuria.
Step-by-step explanation:
Kidney stones are solid crystals that form in urine inside the kidney. They can block the flow of urine out of the body when they become large enough to obstruct a ureter. The blockage can cause severe pain and bleeding. Common symptoms of kidney stones include colicky pain and hematuria, which is the presence of blood in the urine due to minor damage to the inside wall of the kidney, ureter, and/or urethra.