McIngvale revealed the health scare Tuesday afternoon through a Facebook Live stream on his official page, filmed inside an exam room at St. Luke's Hospital.
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The business owner explained that he had tingling in his arm, leg and face, but, in true Mack style, his voice felt normal.
Over the 23-minute stream, Mack took questions and well-wishes from Facebook users. Mack asked for prayers over the treatment, while also talking about the current specials at Gallery.
Mack mentioned his past contributions to stroke health, including financing a mobile stroke unit housed at UTHealth in the Texas Medical Center.
McIngvale is 68 years old, already celebrated as a fixture for good in the Houston community.
His flagship store in north Houston again hosted the annual Autism Prom.
RELATED: Mattress Mack throws prom night at Gallery Furniture for children with autism
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Gallery Furniture holds prom night for children with autism
Mack also received a great deal of credit in the wake of the Hurricane Harvey disaster. His showrooms housed families stranded by the storm.
RELATED: Mattress Mack hosts gathering to reunite with Hurricane Harvey victims who used Gallery Furniture as shelter
Mattress Mack reuniting with Harvey victims