To be perfectly honest, your doctor may or may not be correct. Did he say what made him think it was that? Reasons I'd say it's not: plantar fasciitis is worse in the morning almost always (due to increased inflammation and stasis throughout the night), the location of the pain on the lateral plantar aspect of the foot (it's typically more medial or posterior), and the lack of correlation to a specific portion of gait. To be honest, I'd be more prone to agree with Mr.