Calf pain can result from many different causes. Sometimes something as simple as over-activity causes strain in the calf muscle, or dietary imbalances may cause cramping in the calf.
However, calf pain may be a symptom of more serious problems, as well. Poor blood flow to the legs (peripheral vascular disease) may cause cramping in the calf when walking or sitting with the legs elevated. A blood clot in the calf (deep vein thrombosis) is a very serious problem and also produces pain in the calf.
Calf pain can also be the result of injuries, such as tearing of the calf muscle or tendonitis. In any case, it is not something that should be ignored. A foot-and-ankle surgeon should be seen for a thorough examination and diagnosis to determine whether the cause is due to a serious health problem, an injury or merely overuse.