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(WASHINGTON) —¬†Defense Secretary Lloyd Austin was treated for prostate cancer in December, which led to a urinary tract infection and serious intestinal complications, the Pentagon said Tuesday — answering questions about his secretive hospitalization and the botched notification process that followed.

On Dec. 22, Austin was admitted to Walter Reed National Medical Center and underwent minimally invasive surgical procedure to treat and cure prostate cancer, said Maj. Gen. Pat Ryder, the Pentagon press secretary. He was under general anesthesia during the procedure, Ryder added.

The next day, Austin was discharged and went home, Ryder said. However, on Jan. 1, Austin was admitted again with complications from the Dec. 22 procedure determined to be a urinary tract infection.

On Jan. 2, Austin was transferred to the intensive care unit after an evaluation revealed abdominal fluid collections impairing the functions of small intestines, Ryder said.

“He continues to make progress and we anticipate a full recovery although this can be a slow process,” Walter Reed said in a statement. “During this stay, Secretary Austin never lost consciousness and never underwent general anesthesia.”

The Pentagon has come under fire for not being more transparent about information regarding Austin’s hospitalization, which until Tuesday, had been characterized as a “minor, elective procedure.” The White House learned about Austin’s condition three day after he was hospitalized; Deputy Defense Secretary Kathleen Hicks had not been informed in advance and was on vacation in Puerto Rico when Austin was hospitalized, a U.S. official told ABC News.

Austin’s prostate cancer and its treatment are “deeply personal,” Ryder said during Tuesday’s press briefing.

“As I’ve highlighted, it’s prostate cancer and the associated procedures are obviously deeply personal, and so again, you know, we’ll continue to work hard to make sure we are being as transparent as possible moving forward and again, wish the secretary a speedy recovery,” Ryder said.

From the hospital, Austin is “in contact with his senior staff and has full access to required secure communications capabilities and continues to monitor dod day-to-day operations,” Ryder said.

“He continues to stay very actively engaged with his senior staff and is making important decisions about national security and defense,” Ryder said.

On Monday, Ryder apologized for not being more transparent about Austin’s hospitalization. Ryder said he was informed about Austin’s hospitalization on Tuesday, Jan. 2 — and roughtly two days later went to the podium on Thursday afternoon for an on-camera briefing.

The White House is now ordering a review of Cabinet protocols for delegating authority after the fallout from Austin’s undisclosed hospitalization, according to a memo obtained by ABC News.

The White House memo directs departments and agencies to submit their existing protocols for review by Jan. 12.

The memo, written by White House chief of staff Jeff Zients, says that while the review is ongoing, Cabinet agencies must adhere to procedures, including notifying the White House when agencies anticipate a delegation of authority and documenting the delegation of authority in writing.

The protocols will be reviewed to ensure they address the following: delegation criteria, decision-making authority, applicable documentation, notification procedures, and rescission of delegation.

The memo says agencies should ensure “delegations are issued when a Cabinet Member is traveling to areas with limited or no access to communication, undergoing hospitalization or a medical procedure requiring general anesthesia, or otherwise in a circumstance when he or she may be unreachable.

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