...is a condition where the outer part of the elbow becomes sore and tender. It is commonly associated with playing tennis and other racquet sports, though the injury can happen to almost anybody.
Tennis elbow is an overuse injury occurring in the lateral side of the elbow region, be more specific, occurs at common extensor tendon that originates from the blah blah medical speak... (source)Apparently it's because I was use my left hand to throw the yarn. (apparently I knit Continental?) I think it was more from crocheting, but it didn't stop me or slow me down.