Urethral stones and kidney stones are both types of urinary system stones. The main difference between the two is due to their location within the urinary system: kidney stones are located in the kidneys, while urethral stones are located in the urethra, which is their fundamental difference. The main symptoms of urethral stones include irritation of the urethra, leading to frequent urination, urgent urination, painful urination, and even blood in the urine or urinary retention. For urethral stones, if the stones are relatively small, they can be flushed out of the body by drinking more water and urinating frequently; however, if the stones are larger, surgical treatment is required. In the case of larger kidney stones, they can cause water retention in the kidneys and even infections, and it is advised to have surgery for these stones as soon as possible.