CHICAGO (WLS) -- Civil rights activist Rev. Jesse Jackson was hospitalized on Wednesday in Chicago , the Rainbow PUSH Coalition announced.

In recent years, Rev. Jackson has been seen in a wheelchair, and public comments from the civil rights icon have been waning. It was believed Jackson had Parkinson's disease, but officials with Rainbow PUSH said earlier this year he was diagnosed Progressive Supranuclear Palsy, a neurodegenerative disease.

Jesse Jackson Jr. said Thursday afternoon that his father's condition had improved throughout the day since he had been hospitalized.

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Sources told ABC7 that Rev. Jackson was being treated at Northwestern Memorial Hospital.

Jackson is "under observation for Progressive Supranuclear Palsy (

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