SEOUL, South Korea — Henry Kissinger, the former United States secretary of state, was hospitalized here because of stomach pains on Saturday. But his condition has quickly improved, said a spokesman for Yonsei University’s Severance Hospital in Seoul.

“There is nothing serious about his condition,” Lee Seong-man, the hospital spokesman, said during a telephone interview. “His condition is continuing to improve, and in a case like this, we expect him to leave hospital tomorrow.”

Mr. Kissinger, 86, was brought to the hospital on Saturday morning for abdominal pains, Mr. Lee said. The spokesman said that he had no further details on Mr. Kissinger’s condition.

Mr. Kissinger arrived in Seoul on Wednesday and the next day delivered a speech at the Asan Institute for Policy Studies, a private think tank. On Friday, he met South Korea President Lee Myung-bak and was reportedly scheduled to leave Seoul on Saturday.