I frequently get a sense of tightness in my lower legs most often about a mile into a run, sometimes in one foot other times in both. I've spoken to a doctor about it and my achilles is fine. The problem is that the swelling in the achilles area makes it painful to run and sometimes slows the flow of blood to the feet and my foot begins to tingle and go numb.
If this were the case every time I wouldn't be a runner. However, it doesn't always happen and most of the time when it does happen, with some massage and walking, it goes away, usually after about 3 miles. What is puzzling is why it doesn't happen every time. I've tried stretching and massage, with limited results.
What do you think is happening and how can I prevent it?