Oh, I get those too! We don't stay young all the time - time will come that our body will slowly develop degenerative diseases. One of the many degenerative diseases is plantar Fasciitis.
"Plantar fasciitis is a progressive degenerative condition affecting the thick band of tissue that covers the bones on the bottom of the foot (plantar fascia), and has been associated with heel pain, falls, poor quality of life, and disability. The data for this analysis come from the 2013 National Health and Wellness Survey, a self-administered, Internet-based questionnaire completed by 75,000 participants identified through a Web-based consumer panel. Participants were asked if they experienced any pain within the last year and the last month and were asked to select specific types of diagnoses for their pain from a list that included plantar fasciitis". - National Center for Complemetary and Integrated Health