 [ Symptoms ] can protein shakes help my 17 year old son gain weight   my son is very under weight he eats but not enough to gain weight his doctor recommends that he add 1000 more calories to his daily diet and increase protein for muscle mass build up would weight gain protein shakes work [ Disease ] not very likely a finger prick is done at the peripheral end of the finger pad so there are few nerves that are located here i can hurt yes but true nerve damage would be very unlikely