tnflatbed
ArboristSite Operative
Have you noticed it more with cold weather? As mentioned numerous times vibration is the main culprit. Make sure your chain stays sharp, as it dulls some will tend to try and push the saw through the wood, just adding to muscle fatigue. Feelings of pins and needles or fingers cold to the touch when its not cold isn't anything to ignore. I know of two individuals with Raynaud's one of them has lost 2 1/2 fingers on one hand and 1/2 a thumb on the other. The other fella's hands will turn a slate blue and hurt if they get cold. Look at trying some type of mitigation like trying a pair of padded mechanics gloves or trying a different chain type. I do sheet metal work for a living and one of the things I did was replaced my bars with tungsten as opposed to steel, and further padding the side I'm grasping with foam tape. This went a long way and my hands thank me for it.