What Causes Aching and Swelling in the Lower Leg?

Calf soreness and heaviness may result from the following four causes:

1. Overexertion, prolonged cycling, or hiking can lead to lactic acid accumulation, causing calf soreness and heaviness. Adequate rest is essential during this period; most cases resolve spontaneously. Local massage or soaking feet in warm water can effectively alleviate symptoms.

2. Exposure of the legs to cold temperatures may cause vasoconstriction, resulting in insufficient blood supply and subsequent calf soreness and heaviness. In such cases, maintaining warmth is crucial.

3. Individuals with flat feet often experience fatigue and calf soreness while walking. Due to the absence or flattening of the foot arch, pressure on the blood vessels and nerves in the sole increases, impairing lower-limb circulation and leading to foot discomfort and soreness. Such individuals should strengthen their lower-limb muscles through regular exercises—such as skipping rope and toe raises—and wear comfortable, well-fitting shoes with supportive arch inserts to effectively reduce foot fatigue and soreness.

4. Calf soreness accompanied by low back pain warrants caution for lumbar disc herniation, which may compress spinal nerves and cause radiating pain down the leg. Relieving the nerve compression typically alleviates both the soreness and pain. However, lumbar disc herniation is a complex condition requiring medical supervision for appropriate pharmacological or other therapeutic interventions, along with minimizing bending movements.