WASHINGTON (AP) — Doctors treating U.S. Secretary of State Hillary Rodham Clinton for a blood clot in her head said blood thinners were being used to dissolve the clot and they were confident she will make a full recovery.

Clinton didn’t suffer a stroke or neurological damage from the clot that formed after she had a concussion during a fainting spell at her home in early December, doctors said in a statement Monday.

Clinton, 65, was admitted to a New York City hospital on Sunday when the clot was found on a follow-up exam on the concussion, Clinton spokesman Phillipe Reines said.

The popular secretary of state and former first lady had already planned to step down at the beginning of President Barack Obama’s second term, which begins this month. Whether she will return to work before she resigns remained a question.

The clot is located in the vein in the space between the brain and the skull behind the right ear. She will be released once the medication dose for the blood thinners has been established, the doctors said.

In their statement, Dr. Lisa Bardack of the Mount Kisco Medical Group and Dr. Gigi El-Bayoumi of George Washington University said Clinton was making excellent progress and was in good spirits.

Clinton’s complication “certainly isn’t the most common thing to happen after a concussion” and is one of the few types of blood clots in the skull or head that are treated with blood thinners, said Dr. Larry Goldstein, a neurologist who is director of Duke University’s stroke center. He is not involved in Clinton’s care.

The area where Clinton’s clot developed is “a drainage channel, the equivalent of a big vein inside the skull. It’s how the blood gets back to the heart,” Goldstein said.

Blood thinners usually are enough to treat the clot, and it should have no long-term consequences if her doctors are saying she has suffered no neurological damage from it, Goldstein said.

Clinton returned to the U.S. from a trip to Europe, then fell ill with a stomach virus in early December that left her severely dehydrated and forced her to cancel a trip to North Africa and the Middle East. Until then, she had canceled only two scheduled overseas trips, one to Europe after breaking her elbow in June 2009 and one to Asia after the February 2010 earthquake in Haiti.

Her condition worsened when she fainted, fell and suffered a concussion while at home alone in mid-December as she recovered from the virus. It was announced Dec. 13.

This isn’t the first time Clinton has suffered a blood clot. In 1998, midway through her husband’s second term as president, Clinton was in New York fundraising for the midterm elections when a swollen right foot led her doctor to diagnose a clot in her knee requiring immediate treatment.

Clinton’s three-week absence from the State Department has raised eyebrows among some conservative commentators who questioned the seriousness of her ailment after she canceled planned Dec. 20 testimony before Congress on the deadly attack on the U.S. diplomatic mission in Benghazi, Libya.

Clinton had been due to discuss with lawmakers a scathing report she had commissioned on the attack. It found serious failures of leadership and management in two State Department bureaus were to blame for insufficient security at the facility. Clinton took responsibility for the incident before the report was released, but she was not blamed.

Looking to the future, Clinton supporters have been privately, if not publicly, speculating how her illness might affect a decision about running for president in 2016, when Obama’s two terms are up.

Americans admire Clinton more than any other woman in the world, according to a Gallup poll released Monday — the 17th time in 20 years that Clinton has claimed that title. And a recent ABC News/Washington Post poll found that 57 percent of Americans would support Clinton as a candidate for president in 2016, with just 37 percent opposed. Websites have already cropped up hawking “Clinton 2016″ mugs and tote bags.

After decades in politics, Clinton has said she plans to spend the next year resting. She has long insisted she had no intention of mounting a second campaign for the White House after running in 2008. But the door is not entirely closed, and she would almost certainly emerge as the Democrat to beat if she decided to run again.

Her age — and her health — would probably be a factor under consideration, given that Clinton would be 69 when sworn in, if she were elected in 2016.

Publicly, Democrats reject the notion that a blood clot could hinder her political prospects.

“Some of those concerns could be borderline sexist,” said Basil Smikle, a Democratic strategist who worked for Clinton when she was a senator. “Dick Cheney had significant heart problems when he was vice president, and people joked about it. He took the time he needed to get better, and it wasn’t a problem.”

It isn’t uncommon for presidential candidates’ health — and age — to be an issue. Both in 2000 and 2008, Republican Sen. John McCain had to rebut concerns he was too old to be commander in chief or that his skin cancer could resurface.

Two decades after Clinton became the first lady, signs of her popularity — and her political strength — are ubiquitous.

Even Republicans concede that Clinton would be a force to be reckoned with.

“The Republican Party today is incapable of competing at that level,” Newt Gingrich, the former House Speaker and 2012 GOP presidential candidate, said in December.

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Associated Press writer Josh Lederman, Matthew Lee and Ken Thomas in Washington and AP Chief Medical Writer Marilynn Marchione in Milwaukee contributed to this report.

Copyright 2013 The Associated Press.