As RadarOnline.com previously reported, the 40-year-old took over from Curry after she was unceremoniously axed from the morning show last month, and has been struggling to try and bring TODAY back to the number one spot.
"The pressure of taking over after Ann's execution is taking its toll," a source told The New York Post. "She goes to a doctor two days a week for treatment of the migraines, and is required to wear dark glasses when she's not on set."
Another source opines though that the TODAY spot is not contributing to the migraines and that Guthrie has suffered from them for years.
"Savannah does have migraines. She's had them for years. They are not triggered by anything in particular," the source told the Post. "If she is indeed getting them, she's completely capable of working through them.
"You would never been able to know anything was wrong by watching her at work."