Updated story

Rep. Jesse Jackson Jr. (D-Ill.) is being treated for a mood disorder, according to a statement released by his office.

From Jackson's doctor, via CNN:

"The Congressman is receiving intensive medical treatment at a residential treatment facility for a mood disorder. He is responding positively to treatment and is expected to make a full recovery."

Earlier reports about Jackson's condition suggested he was hospitalized due to alcoholism.

NBC's Andrea Mitchell tweeted that Jackson was staying in a rehabilitation facility in Arizona where he was reportedly receiving treatment for alcoholism.

That initial report claimed Jackson was also receiving treatment for addiction, but NBC Chicago later reported the congressman is only being treated for alcoholism.

Jackson's office subsequently denied the NBC report, according to a tweet from ABC's John Parkinson.

Sandi Jackson, Jackson's wife, further clarified to NBC Chicago that her husband is not in rehab, but did not provide additional details. Rick Bryant, a Jackson aide, told Talking Points Memo the NBC report is “not true!

Jackson, 47, went on medical leave June 10 but did not publicly disclose his decision until two weeks later. Last week, Jackson's office released a statement reporting that the congressman was being treated at an inpatient medical facility for "physical and emotional ailments" that are "more serious" than initially believed.

Earlier Wednesday, both House Leader Nancy Pelosi and Rep. Steny Hoyer (D-Md.) contributed to mounting pressure for an update on Jackson.

On Tuesday, the Rev. Jesse Jackson, Jackson's father, told an NBC affiliate in Chicago that it was "inappropriate" for him to disclose his son's medical condition.

The Chicago Democrat is currently the subject of an ethics investigation related to Illinois' imprisoned former governor Rod Blagojevich, though Jackson has never been charged with any wrongdoing.

This is a developing story.

Earlier on HuffPost:

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  • Jesse Jackson Jr.

    FILE - In this March 21, 2010 file photo, Rep. Jesse Jackson, Jr., D-Ill., uses his PDA to photograph demonstrators outside on the U.S. Capitol as the House prepares to vote on health care reform in Washington. When Jackson disappeared on a mysterious medical leave in June 2012, it took weeks for anyone in Washington to notice. Jackson has never lived up to the high expectations on the national stage.

  • Jesse Jackson, Jr.

    FILE - In this Jan. 5, 2011 file photo, Rep. Jesse Jackson, Jr., D-Ill., is pictured before a ceremonial swearing in of the Congressional Black Caucus on Capitol Hill in Washington.

  • Jesse Jackson Jr.

    FILE - In this May 16, 2011 file photo, U.S. Rep. Jesse Jackson Jr. attends ceremonies for Chicago Mayor-elect Rahm Emanuel in Chicago. (AP Photo/Charles Rex Arbogast, File)

  • Jesse Jackson Jr.

    FILE - In this Tuesday, March 20, 2012 file photo, U.S. Rep. Jesse Jackson Jr., D-Ill., thanks supporters at his election night party in Chicago. Jackson's office announced Monday, June 25, 2012 in a news release that the congressman has been on a medical leave of absence since June 10 and is being treated for exhaustion. (AP Photo/M. Spencer Green, File)

  • Jesse Jackson Jr., Sandi Jackson

    U.S. Rep. Jesse Jackson Jr., D-Ill., and his wife Chicago Alderman Sandi Jackson, thank family members at his election night party Tuesday, March 20, 2012, in Chicago after his Democratic primary win over challenger, former Rep. Debbie Halvorson, in the Illinois' 2nd District. (AP Photo/M. Spencer Green)

  • Jesse Jackson Jr., Sandi Jackson

    U.S. Rep. Jesse Jackson Jr., D-Ill., and his wife Chicago Alderman Sandi Jackson, embrace at his election night party Tuesday, March 20, 2012, in Chicago after his Democratic primary win over challenger, former Rep. Debbie Halvorson, in the Illinois' 2nd District. (AP Photo/M. Spencer Green)

  • Timothy Geithner, Jesse Jackson Jr.

    Treasury Secretary Timothy Geithner, right, declines an offer by U.S. Rep Jesse Jackson Jr., D-Ill., to talk to reporters during a tour of the Ford Motor Company Stamping Plant in Chicago Heights, Ill., Wednesday, April 4, 2012. (AP Photo/Charles Rex Arbogast)

  • U.S. Rep. Jesse Jackson Jr., Sandi Jackson

    U.S. Rep. Jesse Jackson Jr. and his wife, Chicago Alderman Sandi Jackson, ask each other for their support and votes as they arrive at a polling station for early voting, Friday, March 9, 2012, in Chicago. (AP Photo/M. Spencer Green)