A UTI is an infections of the bladder (cystitis) or urethra (tube that carries urine out of the body).  Symptoms of UTIs include:

An infection of the upper UTI (kidneys or ureters) cause the above symptoms but also more extreme symptoms such as:

Upper UTIs can cause damage the kidneys or spread to the bloodstream and need to be treated quickly.

Antibiotics are usually recommended because untreated UTIs can potentially cause serious problems if they’re allowed to spread.

Treatment

UTIs are normally treated with a short course of antibiotics and symptoms normally improve in a few days.