NBA Legend Jerry Sloan -- Diagnosed with Parkinson's & Dementia

Legendary Utah Jazz coach Jerry Sloan is battling both Parkinson's disease and Lewy body dementia ... according to a report in the Salt Lake Tribune.

Sloan -- who coached great Utah teams featuring Karl Malone & John Stockton -- told the paper he decided to reveal his diagnoses because his symptoms have become visibly noticeable.

According to the Mayo Clinic, Lewy body dementia is a condition that causes a progressive decline in mental abilities and can sometimes cause hallucinations.

Despite the setbacks Sloan says he's still walking 4 miles a day and is adamant he's not looking for sympathy from anyone.