Jayson Tatum's appearance at Drake's concert on Wednesday night turned out to be a very painful experience for one fan ... 'cause during her freak-out over the Celtics star's cameo -- she wiped out down six rows of stairs.
The wild incident happened in the nosebleeds at TD Garden arena during the It's All A Blur Tour's stop in Boston ... after the rapper introduced the NBA star to the sold-out crowd.
The woman started to jump up and down when Tatum got on stage -- and she screamed at the top of her lungs, "Jayson Tatum!!"
Drake bringing out Jayson Tatum while he’s wearing DND is wilddd.
But, somehow during the meltdown, she lost her balance ... tripped over a chair -- and then face-planted all the way down several steps.
Check out the footage of the fall ... she hit the pavement HARD.
No word on if she suffered any significant injuries ... but the TikTok user who posted the clip humorously captioned it, "big tatum fan!" -- so we get the vibe she's doing all right.
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The night otherwise went off without a hitch ... and Drake seemed to be very pleased with his work inside the Celtics' home -- saying on his IG after the show, "Who else can get the Garden b(l)ooming like this?"
Next stop for Drake's tour is the Bell Centre in Montreal ... try to stay safe in your seats, everyone!