Rep. Tom Kean Jr., R-N.J., arrives for a vote at the Capitol, Tuesday, in Washington. (AP Photo/Rod Lamkey, Jr.)

WASHINGTON (AP) — New Jersey Republican Rep. Tom Kean Jr. disclosed Tuesday that he was being treated for depression during his unexplained four-month absence from the House, suggesting in a brief floor speech that he remained silent about his condition until now because he is a “private person by nature.”

Depression, Kean said, “is physical, it is emotional, and until you experience it yourself, it is difficult to fully understand how powerful this illness can be.”

Kean’s reappearance came weeks after his victory in an uncontested primary on June 2 and months after he last cast his vote in the House. His speech ended the silence on his condition, yet left questions unanswered. Kean said he first entered the hospital due to health concerns and underwent testing, but offered no further details.

After the speech, Kean left the Capitol quickly without answering questions from reporters.

Kean last voted in the House on March 5. His absence had complicated matters for House Republican leaders, who have been struggling to pass bills with their threadbare majority.

Kean said he was diagnosed for depression and that doctors recommended he remain in the hospital. Addressing his earlier statement that he expected to return to work in a matter of weeks, Kean said he believed that at the time and it was his doctors’ best estimate then.

“But as the over 48 million of my fellow Americans being treated for this illness have come to discover there is no timeline for healing,” Kean said.

“Today I stand before you healthier, stronger and excited to return to the work that I love.”