Tracy Morgan caused a lengthy delay at the Knicks game Monday night … after he upchucked all over the floor.

The troubling scene unfolded during the first half of New York’s tilt with the Miami Heat at Madison Square Garden … when the comedian suddenly got sick in his courtside chair.

Images taken by fans at the arena show Morgan vomited near his feet … and so much came out of his stomach, some of the contents actually splashed onto MSG’s playing area.

Morgan — a Knicks superfan — was put into a wheelchair and pushed out of the area. He seemed visibly distressed as he held a towel to his face. Spectators stated they could see blood coming from his nose as he exited.

No word at all yet on what caused the medical episode … but the Knicks vs. Heat game has resumed. New York currently leads 109-84.