It burns to pee and i've been tested for stds and uti and nothing. i had an ultrasound done to see if i'm pregnant and i wasn't. help?

Chemical irritation: If you are free of infection review what you are drinking. Excessive acids from juices/sodas can cause the urine to be irritating. Caffeine can also cause irritation of the bladder. Stick to lots of water for a week and see if that changes things. If you wear panty liners make sure they are scent free and consider washing your underwear in sensitive skin detergents.