Urinary tract infections (UTI) are the most common cause of frequent urination. These are bacterial infections in your bladder, urethra or other parts of your urinary tract. They include cystitis (bladder infection), urethritis (infection of the urethra) and pyelonephritis (kidney infection). More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.