Occasional feeling of "pins and needles" (as if your palms and fingers are falling asleep) is often observed by people who are taking daily doses of 4IU of HGH or higher.
This is especially noticed following repetitive strain in the wrist area (during workouts, etc.) or when first waking up. This is caused by the increase of muscle mass in the wrist, which puts pressure on the carpal tunnel, through which the nerves are passing to your fingers and palms.
This is a temporary side effects which goes away completely after the dosage is lowered or within 3 weeks after the cycle is discontinued. As long as it does not become unbearable the athletes usually continue with their growth hormone cycle desipte the carpal tunnel syndrome.
This side effect is an issue only in initial cycles. In the subsequent HGH cycles the wrists have had the time to adapt and carpal is barely noticeable.