Common injuries caused by poor ergonomics include carpal tunnel syndrome (caused by incorrect positioning of arms/hands while typing or using a mouse and through repetitive motions), tendinitis (swelling affecting overused or strained tendons, often caused through incorrect seating arrangements), muscle strains in the lower back or neck (caused by the angle of chair, angle of your head in relation to monitor), and rotator cuff injuries or other shoulder problems (caused by incorrect sitting posture or angle of arms).