The TIA's can be very scary, but in many cases no lasting results, thankfully. I think they can be brought on by stress (notice I say "I think") that's just from witnessing my elderly aunt have to experience these things. She would try to pick something up & crash...onto the floor it went...the Dr. said bring her in immediately....I did....more than 2 hours later he finally had time to look at her....by then....alot of the weakness had disappeared. It's scary but.... many years later when she passed, it had nothing to do with the mini strokes (TIA)