Why isn't my USB port working?

I always leave in the USB plug for my wireless mouse in the laptop, and the mouse has always been detected. The other day I turned on my laptop and it refused to detect the mouse. I tried changing the batteries in the mouse but that was not the Issue. I also tried removing and reinserting the USB in the same port. It was only when I tried the one of the USB ports on the left side of the laptop that it worked (I always use the one on the right). That's when I figured the USB port on the right is broken. I'm always using removable devices and would like all 4 ports working. How can I get this fixed?