After leaving the 9/11 memorial service early due to pneumonia, Alex Hein has the details of the Democratic nominee's ailment in "Housecall for Health."

This is Housecall for Health.

On Sunday, Democratic presidential nominee Hillary Clinton was captured on video, faltering after according to her campaign, she became overheated. Later they revealed the 68-year-old had been diagnosed with pneumonia recently, which is a serious condition, but something she should soon recover from. The Clinton campaign says she was put on antibiotics and advised to rest and modify her schedule.

Pneumonia is commonly treated quickly and effectively with antibiotics. One expert said the diagnosis should not impede her function going forward. However, another doctor said people over the age of 65 have a harder time returning to normal, than do younger patients and may need a week or more to recover from even a mild case. 

Experts also said she is at a high risk for such an infection as she is constantly in enclosed spaces and face to face with thousands of people.

For more on this story check FOXNewsHealth.com.

Housecall for Health, I'm Alex Hein, FOX News.

Follow Alex Hein on Twitter: @Ahlex3889