Calf pain is pain in lower back of leg between knee and ankle region. Calf region has two muscles – gastrocnemius and soleus and two bones – larger tibia and smaller fibula. Strain in any of these may cause calf pain.
Sudden pain in calf muscles that may last for a few seconds or may continue on and off for few days. These occur mostly due to vitamin deficiencies or due to exercising. Other causes include thyroid deficiency, poor blood flow to the region or nerve damage due to diabetes.