J.J. Watt on Friday said his younger brother, Pittsburgh Steelers linebacker T.J. Watt, had to undergo surgery after experiencing a partially collapsed lung following "a dry needling treatment session” at the team’s facility in Western Pennsylvania.

Well, the cause of Pittsburgh Steelers linebacker T.J. Watt's partial lung collapse has finally been revealed. According to his brother J.J., the injury was suffered during a dry needling session at the team facility. The elder Watt said he has surgery to stabilize it on Wednesday and is being released from the hospital on Friday.

Steelers T.J. Watt was hospitalized after a dry-needling session, underwent surgery, and is now recovering with an expected release soon.