Body part
Calf
Skeletal Muscular
The gastrocnemius and soleus muscles — a common site of night cramps and post-exercise soreness.
Common conditions
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Muscle cramps
Sudden, involuntary, painful muscle contractions, often in the calf and often at night.
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Muscle soreness (DOMS)
The achy, tender muscles that appear a day or two after unfamiliar or intense exercise.
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Chronic venous insufficiency
When leg veins struggle to return blood to the heart, causing aching, heaviness, swelling, and varicose veins — usually worse after standing.