What are Shin Splints? Shin Splints (Medial Tibial Stress Syndrome) are caused by inflammation of the muscles and tendons attached to your shin bones. It’s typically caused by overuse, often resulting from a sudden increase in intensity of physical activity. For example, someone suddenly decides to take up jogging and does too much too soon. For runners, poor running technique or improper footwear can exacerbate the problem. Some people may be predisposed to shin splints if t