President Obama had his sore throat checked out Saturday and, according to his doctor, Ronny Jackson, it's caused by acid reflux.

Jackson said the president has been complaining of a sore throat for a few weeks. Jackson recommended some tests. An ear, nose and throat specialist performed an examination of the president's throat using a fiber optic cable Saturday, Jackson said.

Jackson said the tests showed swelling in the back of the president's throat, so a CT scan was ordered at Walter Reed National Military Medical Center in Bethesda, Md. He said the scan was performed Saturday out of convenience, not urgency. The scan came back normal. Acid reflux was blamed for inflaming the president's throat tissue. Obama spent about 30 minutes at the hospital before returning to the White House. - Washington Post