A runner's calf pain was a sign of a rare condition. It took years to find a doctor who could treat it.

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A runner's calf pain was a sign of a rare condition. It took years to find a doctor who could treat it.

Military veteran and avid runner Sierra Prindle was used to muscle pain, but the agony she was feeling in her left calf was something she'd never experienced before. It started when she was around 30, with muscle spasms and weakness after working out. Then, on a camping trip with her mom and her two kids, Prindle sat down and couldn't get back up. At the emergency room, doctors diagnosed her with a slipped disc and prescribed steroids. But as the years went on, the pain got worse. Prindle said she was \"constantly going to doctors,\" but no one had an answer for ..