When the lining that surrounds the muscles does not expand to allow for increased muscle size during exercise, pressure builds up and the pain increases – leaving the patient unable to continue with the activity.
The issue is not fully understood in terms of why some people suffer more than others, but in the case of sports injuries the cause could be affected by a sudden increase in activity and distance, too much running on hard surfaces, insufficient rest, poor footwear, bad foot positioning during the activity, or a huge change in the type of running you are doing.