Diagnosing a hamstring problem.

Every time I run a long distance I feel discomfort in my right hamstring. I want to increase my speed after six miles but cannot due to the pain. After a recent half-marathon during which I had hamstring pain from the midpoint of the race to the finish, I experienced pain in the gluteus maximus and right knee. What's wrong? This has happened to me in the last five half-marathons I've run.

Sue Caldwell

Pipe Creek, TX

This is a very common problem with several possible causes. It is an overuse problem with its root in a mechanical error. Are you a veteran runner or is this a relatively new sport for you? Training can be a factor. What is the time frame in which you've run all these half-marathons? Make sure you are allowing enough recovery time between races and hard workouts.

There is likely a weakness in the stabilizing muscles of your pelvis. This can lead to overuse of the hamstrings and adductors and cause strain or tendinitis in these groups. Another cause may be a dysfunctional sacroiliac joint (between your tailbone and hip). You will likely need to see a physical therapist to overcome the problem, whatever its cause. In the meantime, take time off from running, and crosstrain as long as it doesn't hurt.

John Cianca, MD

Houston, TX