Hi,
My partner is an avid gym user 5 days a week, for many years, eats clean and healthy and experiences a strange tingling sensation like pins and needles in his fingers, hands and sometimes lower arms at random points throughout the day even when he isn't training in the day/on weekends. He gets the same sensation at the same point right at the centre of his back - which he describes as lots of needles stabbing in a small spot and it's always right in the same place at random times in the day - made worse by movement.
He also feels like he has slight muscle weakness, almost like he can't grip tight like he has been able to do in the past.
He's had numerous blood tests which all came back fine, anybody else experienced anything similar?