I constantly feel the urge to go pee even after i've went. what could of caused this and how can i cure it?

Get evaluated.: Normally, the sensation of urgency is caused by a full bladder. But any source of irritation to the bladder, such as a urinary tract infection (UTI) will give you sensations of urgency, frequency, & sometimes pain. Your bladder may also be very sensitive to these signals of stretching & irritation, a condition known as overactive bladder. See your gp for a history, exam, & urine test.