Why does my left leg hurt when walking, and what should I do?

Generally, left leg pain while walking may be caused by muscle fatigue, muscle strain, osteoporosis, lower limb varicose veins, sciatica, and other reasons. It is recommended to seek medical attention promptly, identify the cause, and receive symptomatic treatment under a doctor's guidance. Detailed explanations are as follows:

1. Muscle fatigue: Prolonged walking, standing, or engaging in extensive leg exercises can lead to excessive fatigue in the left leg muscles and lactic acid buildup, causing pain. Typically, the discomfort can be relieved with rest.

2. Muscle strain: Excessive exercise, sudden vigorous activity, or incorrect posture may cause a left leg muscle strain. Pain may occur while walking, often accompanied by localized tenderness. It is recommended to stop the activity that caused the strain immediately to avoid further injury. If necessary, use assistive devices such as crutches to reduce the load on the left leg.

3. Osteoporosis: Common among elderly individuals and postmenopausal women, osteoporosis involves reduced bone density and brittle bones. The left leg bones may experience pain while walking due to stress, and in severe cases, even mild activity or daily walking can cause discomfort. Treatment may include medications such as calcium carbonate tablets, alfacalcidol soft capsules, and elcatonin injection, under a doctor's guidance.

4. Lower limb varicose veins: Incompetent venous valves in the legs can lead to impaired blood flow and varicose veins. Due to poor circulation, the left leg may experience aching, heaviness, and other pain symptoms while walking. Symptoms can be alleviated under professional guidance through the use of compression stockings, warm compresses, massage, and other methods.

5. Sciatica: Compression or damage to the sciatic nerve—for example, sciatica caused by lumbar disc herniation—can result in radiating pain down the left leg. The pain may radiate from the buttocks down the back of the thigh and calf and may worsen while walking. Under a doctor's guidance, medications such as ibuprofen sustained-release capsules and aspirin tablets may be used for treatment.

In daily life, it is important to keep the left leg warm, especially in cold weather or air-conditioned rooms. Wearing warm clothing such as thermal pants and knee protectors is recommended, as cold temperatures may cause muscle contractions and vasoconstriction, which can exacerbate pain.