WASHINGTON (AP) -- President George W. Bush has had an MRI of his left shoulder in an attempt to understand why he has experienced pain recently.

White House spokesman Gordon Johndroe told reporters that Bush had the exam while at Walter Reed Army Medical Center on Monday afternoon to visit wounded soldiers. White House physician Richard Tubb performed the MRI and Johndroe said it is possible the results will be available later in the day.

Bush's activities have not been restricted by the pain, and Tubb says the problem is probably the result of no more than wear and tear.

The president was seeing soldiers recovering at Walter Reed from severe injuries suffered in the wars in Iraq and Afghanistan.

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