Kidney Stones
The pain from these itsy bitsy masses (which range in size from a grain of salt to a pearl) comes on fast and furious, with the back, lower abdomen, and groin area being in the greatest discomfort. Most of the time, doctors prescribe pain-killers and advise you to drink plenty of water and wait. Once you pee out the stone, the pain subsidies almost immediately.
But don’t think you’re out of the woods yet: The doctor will probably suggest that you have the stone tested, because, depending on the type, changes in your diet may prevent the whole ordeal from happening again.