Lowell Lagard, 59, disappeared after leaving St. Joseph Hospital where he was treated and discharged just after 11pm.
Police say he has a feeding tube in his stomach.
Lagard is a black man with brown eyes, gray hair and a dark complexion. He 6 feet 2 inches tall and weighs 140 pounds. He was last seen wearing a purple sweater, dark blue pants and red and white tennis shoes with the name "Bud" written on the sides.
If you know Lagard's whereabouts, please contact the Houston Police Department Missing Persons Unit at 713-731-5223.
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