News that the former gymnast Mary Lou Retton, 55, is “fighting for her life” after developing pneumonia has prompted an outpouring of support and donations from her fans, who recall her as a vibrant teenage Olympian and know her now as the devoted mother of four daughters.

The specifics of Retton’s illness haven’t been disclosed, but pneumonia is a common illness that can sometimes turn severe and require hospitalization.

The Post contacted experts for more information about the symptoms of pneumonia, how it’s treated, how to prevent it and when to seek hospital care. Here’s what we know.

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