references
  
      Merck Manual: “Plantar Fasciosis”
    
      U.S. National Library of Medicine: “Ankylosing Spondylitis”
    
      Mayo Clinic: "Achilles Tendonitis"
    
      Cleveland Clinic: "Plantar Fasciitis"

Is this an emergency? If you are experiencing serious medical symptoms, please see the National Library of Medicine’s list of signs you need emergency medical attention or call 911.

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Image Credit: simarik/iStock/GettyImages

Image Credit: simarik/iStock/GettyImages

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      Merck Manual: “Plantar Fasciosis”
    
      U.S. National Library of Medicine: “Ankylosing Spondylitis”
    
      Mayo Clinic: "Achilles Tendonitis"
    
      Cleveland Clinic: "Plantar Fasciitis"