A mini stroke is a temporary interruption of blood flow to the brain. The symptoms are very similar to that of a regular stroke, but do not last nearly as long. What is happening is actually not a mini-stroke at all, but rather, it is a condition called TIA (transient ischemic attack), and it usually lasts only a couple of minutes, to a couple of hours. It does not cause permanent damage, nor does it damage brain cells, as opposed to a stroke, which can wreak havoc on brain cells and cause serious permanent damage or disability. They can, however, lead to a stroke if they recur, and should be taken very seriously.