5. Bladder stones
Similar to kidney stones, bladder stones form when minerals found in the body turn into hardened stones. The minerals attach to the walls of the bladder, where they crystallize. The stones can block the flow of urine, or when they are being passed, blood may be found in the urine.
When the blood in the urine is caused by bladder stones, often, an extreme degree of pain will also be experienced. Additionally, other symptoms may present, including a fever and chills.