Carter, 85, is said to be resting comfortably, CNN reports.
Airport emergency crews took him to Metro Health Hospital for observation upon arrival, after an initial checkup.
His appearance at noon for a signing event at Cleveland’s Joseph-Beth Booksellers was canceled.
"He is fully alert and participating in all decision-making related to his care," the hospital told CNN, adding that they received a phone call from President Barack Obama on the former president's condition. "The decision to admit him overnight is purely precautionary."
Carter will resume his book tour later this week.
