I saw an article in a canoe/kayak magazine once about a doctor in Europe who studied the odd foot complains in paddlers. From the various foot malformations and injuries, she could tell what sort of boat and water conditions the person preferred. Of course, Whitewater squirt boaters (those are weird little low-profile fiberglass kayaks made to slice through the top few inches of a river or stand on end with very little effort) had awful feet- twisted and squeezed, with many an ankle swelling and evidence of breaks.

My point is, what kind of physical manifestations might a doctor find to be common to cartoonists?

Lower back trouble? Carpel Tunnel syndrome? Nearsightedness? Arthritis? Hunched shoulders? Pinched expression? Lung cancer? I bet we're a dull lot compared to, say, construction workers?