What is the definition or description of: burning sensation when urinating?

Here are some...: Burning urination is a general descriptive term denoting an over-sensitized state of urethral lining secondary to injury by inflammation from bacterial UTI or STD-related urethritis or physical trauma, and its severity may range from just feeling a tad of irritation on urine flowing passage to unbearable pain leading to inability to relax to pee. In short, it is quite arbitrary in use.