What causes severe thigh pain after exercise that makes it impossible to squat?

Under normal circumstances, the main causes of thigh pain after exercise that makes squatting difficult include lactic acid buildup, mild muscle strain, quadriceps tendinitis, knee synovitis, and hamstring injury. If discomfort occurs, it is recommended to seek timely medical evaluation and treatment at a正规 hospital. Detailed explanations are as follows:

1. Lactic Acid Buildup

Excessive intensity or prolonged duration of exercise leads to anaerobic respiration in the thigh muscles, producing large amounts of lactic acid. Accumulation of lactic acid within the muscles stimulates nerves, causing pain and difficulty in squatting or standing up. Discontinue intense exercise; elevate the legs during rest, soak feet in warm water to promote blood circulation, and gently massage the thigh muscles to facilitate lactic acid metabolism.

2. Mild Muscle Strain

Inadequate warm-up before exercise or overly vigorous movements may cause minor tearing of thigh muscle fibers. Pain worsens when squatting due to increased tension on the injured muscles. Reduce activity involving the thighs, avoid squatting or jumping, apply moderate compression with an elastic bandage, use cold compresses during the acute phase, and switch to heat therapy later to relieve pain.

3. Quadriceps Tendinitis

Prolonged or repetitive stress on the quadriceps tendon during exercise can lead to aseptic inflammation. When squatting, the tendon is stretched, irritating the inflamed area and intensifying pain. Under medical guidance, medications such as celecoxib capsules, diclofenac sodium sustained-release tablets, or loxoprofen sodium tablets may be used. Avoid activities that increase tendon load, such as climbing stairs or deep squats.

4. Knee Synovitis

Excessive friction or impact on the knee joint during exercise can damage and inflame the synovial membrane, leading to increased joint fluid accumulation. When squatting, pressure within the joint increases, resulting in referred pain in the thigh. Under medical supervision, nonsteroidal anti-inflammatory drugs such as ibuprofen sustained-release capsules, etoricoxib tablets, or naproxen sodium tablets may be taken. In severe cases, arthroscopic synovectomy may be necessary. After surgery, avoid strenuous physical activity.

5. Hamstring Injury

Sudden forceful contraction or overstretching of the hamstrings during exercise may result in muscle tear or contusion. When squatting, contraction of the hamstrings exacerbates pain at the injury site. Under medical advice, medications such as eperisone hydrochloride tablets, chondroitin sulfate sodium tablets, or mecobalamin tablets may be prescribed. Combine with rehabilitation exercises to gradually restore muscle function, and avoid running or jumping too early in the recovery process.

In daily life, ensure adequate warm-up before exercising and avoid sudden increases in exercise intensity. Stretch the thigh muscles promptly after exercise to promote lactic acid clearance. Wear appropriate sports gear to reduce the risk of injury. Rest immediately when pain occurs to prevent further damage. Regularly perform strength training to enhance muscle endurance and resilience.