TIA which is other termed as transient ischemic attack or simply as mini-stroke will occur when a temporary drop of the blood supply to the brain, depriving it of essential oxygen. The patient now will experience stroke-like symptoms, although they will not last long. A mini-stroke will only last a few minutes and goes away within a day.
In other words, a TIA is like a stroke, produces similar symptoms, but only lasts a few minutes and causes no permanent damage.
Health experts say a TIA may be a warning. At about 30% of people who have a TIA eventually go on to have a stroke. Half of that 30% have a stroke within a year of their TIA. Although some may call it a warning, it may also be seen as an opportunity to take steps to prevent a full blown stroke.