Publicist Gary Mantoosh declined to comment further.
A statement issued by Wolf Films, the production company of Law & Order creator Dick Wolf, said Hargitay's condition is improving.
"Mariska is feeling better," said Tuesday's statement. "We are looking forward to her quick recovery and return to set."
Hargitay, 44, won an Emmy last year for her role as Detective Olivia Benson on the show.
