What causes the bottom of the foot to cramp intensely when stretching in bed?
1. Introduction Intensely cramping in the bottom of the foot when stretching in bed is typically caused by a sudden biomechanical shortening of the intrinsic plantar muscles combined with nocturnal motor nerve hyperexcitability. When the foot is pointed downward during a morning or nighttime stretch, these muscles contract forcefully from an already shortened position, triggering … Read more
