Team spokesman Dwayne Harrison said Wood's grandfather was taken to a hospital for evaluation, but he was alert and conscious. His name wasn't immediately available.
A visibly upset Wood followed behind the stretcher, and officials stopped the 20-minute intrasquad scrimmage with 3:35 left.
It was part of the "Primetime with the Pack" event for the Wolfpack, who are expected to be among the favorites in the Atlantic Coast Conference. It included second-year coach Mark Gottfried entering by riding a zip line down to the court from the second level of the PNC Arena stands.
The event drew more than 10,000 fans.