I have started feeling some heat sensation in my left palm.i do heavy workout. what is the cause?

Several ideas: I wonder if the median nerve in your wrist is being irritated by your work out. Extension of the wrist can put undue stress on the nerve. Too much weight on the palm also irritate the nerve causing a sensation of heat in the palm. Try adjusting your work out so there is not too much stress on the palm or wrist. If symptoms continue, see your doctor. Hope this was helpful. Best of luck. Dr. R