Kubiak suffered a transient ischemic attack (TIA), which is basically a mini-stroke. He's most likely done for the rest of the season. After suffering the first you're extremely likely to not only have more attacks but also suffer from a stroke (roughly 50% of the people affected by TIAs have a full blown stroke within the first year). My Grandma had these for the last couple years of her life and was ultimately the result of her passing. This is a pretty serious issue, much worse than a heart attack. Like I said I'll be shocked if he's ALLOWED to come back this season.
source:
Twitter / RapSheet: #Texans coach Gary Kubiak has ...