Intense pain when i run over 50 paces, in chest, down my arms and into my hands.not out of breath and if i cycle i just get numb hands.had cortisone in c7 for arm pain 2yo.is this neurological too?

Probably: If you had previously been treated for a cervical spinal condition and are now having these symptoms it is likely that the cause is located there. See a spine surgeon and be evaluated. Good luck.

Very concerning: Chest pain with activity is very concerning and points to a possible heart issue. Seek medical care as soon as possible. This could be life threatening.