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It’s not clear to us what you mean by cramping or the location of your discomfort. Side pain (often called a runner’s stitch) is common. The cause isn’t clear, but it is not dangerous. Usually the pain is located in one or both sides of the upper abdomen and it slowly goes away with rest, or even if the running is continued, sometimes at a slower pace.
Pain or cramping in the legs or other large muscles groups can be the result of the build up of lactic acid, a breakdown product of energy that accumulates in muscles during anaerobic exercise (like running long distances). This type of pain usually isn’t severe. There are some very rare genetic muscles problems in which abnormal breakdown products accumulate and cause severe leg pains and sometimes weakness or inability to move. If the pain is in your legs, you should give your doctor a call and set up an appointment to get checked.
For more information, check out this article:
Conditioning Your Body Properly
Posted 9-25-06
Do you have a question?  As a reminder, this information should not be relied on as medical advice and is not intended to replace the advice of your doctor. Please read our full  .
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