Pay attention if your feet are sending you any of these 15 warning signs.
Toes that bump upward at the tips -- "Digital clubbing" happens when the tips of your toes swell to the point that they appear to bump upward at the ends, and can be a sign of serious lung disease, heart disease and certain gastrointestinal diseases like Crohn's disease.
Jessica Rinaldi / Reuters
Pete Souza/White House Photo
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