'Acid reflux behind Obama ailment'
Acid reflux is causing US president Barack Obama's sore throat, according to the White House.
Mr Obama's physician said the results of a CT scan carried out on the president, prompted by complaints of a sore throat, came back as normal.
Dr Ronny Jackson said Mr Obama's symptoms are consistent with soft tissue swelling related to acid reflux.
Dr Jackson said he supervised a fibre optic examination of the US president's throat by an ear, nose and throat specialist.
That examination revealed swelling in the back of the president's throat.
Dr Jackson said he and the specialist then determined that a follow-up CT scan should be the next step.
Mr Obama underwent the scan at a military hospital just outside Washington.