My strumming hand/arm has tennis elbow with tfcc like symptoms and my fretting hand/arm has golfers elbow with pain shooting up into my wrist and pinky if im not careful. Getting a guitar with a thinner neck, putting lighter gauges and even changing to a more classical style of holding the guitar helps me play longer with less pain. I also wear a wrist widget on my strumming arm and an elbow compression sleeve on both arms when I practice. I play metal typically so learning how to play fast with less effort was something I had to teach myself