It is normal for your feet to swell a little bit during exercise--enough to make a difference of about one shoe size, but some people may experience even more swelling than that. Others also experience noticeable hand swelling while running or walking. When this swelling is "normal" (not the result of a medical condition), it will usually disappear fairly soon after the exercise stops, and won't involve other symptoms.
If you experience swelling in your extremities, along with symptoms like pain, redness, and shortness of breath, and/or the swelling doesn't go away within a couple of hours after you stop exercising, you should check with your doctor to see if something else is going on.
There are many possible explanations for this exercise-induced swelling, and in most cases, several factors probably contribute to it. Here are a few tips for minimizing the problem:
More From SparkPeople