A muscle twinge is a type of pain or discomfort that can be caused by a variety of factors. The three crossword solutions for this term are SPASM, KINK, and CRAMP. A SPASM is an involuntary contraction of a muscle or group of muscles, while a KINK is a sharp bend or twist in something, usually referring to a muscle. A CRAMP is a sudden, involuntary contraction of a muscle or group of muscles that causes pain. All three of these terms can be used to describe the sensation of a muscle twinge.