Carpal tunnel syndrome is often the result of repetative hand motions such as computers and yes weight lifting. Many things can aggravate this, one element in particular can be water retention. Occasional use of a diuretic may help. An associated condition with symptoms such as Zyg has mentions is TOC or Thoracic Outlet Syndrome which actually radiated from a compressed nerve between the clavical area. Numbness and tingling in the complete arm signal this possible condition.