I am 25, fit, and active. Every couple of weeks I get achy pain in my calves that lasts for a couple of days. I get minor relief by stretching a bit, but the pain is worse at night and when I am sitting. Working out, particularly biking, provides relief during excersize, but the pain returns once completed.
I also have a congenital heart defect, not sure if it could be playing a role.
In regard to the possible diagnosis of clot formation, I would not be too concerned. Pain induced via occulsion of bloodvessels which supply muscles is quoted to be "one of the most agonising pains known to man", to put it simply with your age and level of physical activity if the pain is induced from clot formation you would be in the hospital rolling around in pain.
Possible avenues to look at as a cause of your pain: Posterior Tibial dysfunction, tibio-fibular micro fractures, vascular issue (such as: impaired 02 to muscles when exercising, is swelling present?) or imbalances of sodium/calcium/potassium. Though the most likely causation due to relief provided with stretching and biking is an ankle equinus, due to tight gasto/soleus.
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