你这描述很模糊。AI给你5个可能的原因。需要你自己测试或者去看PT

你需要分辩确切位置，尝试看哪些其他动作引起疼痛，哪些方法可以减轻疼痛。我的直觉是你的两边肌肉力量不平衡引起的。可能是弱在core和hips
Pain on the outside of the leg can have a number of causes, including:

• Peroneal tendonitis 
  Also known as peroneal tendinopathy, this condition can cause pain on the outside of the foot and lower leg. It's often caused by overuse, such as excessive walking or running, especially on hard or uneven surfaces. It can also be caused by a sudden injury, like an ankle sprain. 
• IT band inflammation 
  The IT band is a long piece of connective tissue that runs from the pelvis to the shinbone. It presses against the outside of the thigh and knee, so inflammation can cause pain from the hip to the knee.
• Meralgia paresthetica 
  This condition can cause pain, numbness, or a burning feeling in the outer thigh. It's caused by injury or entrapment of the lateral femoral cutaneous nerve (LFCN). People who are overweight, pregnant, or have diabetes are more likely to have it. 
• Shin splints 
  Also known as medial tibial stress syndrome, this condition can cause pain on the outside of the lower leg. 
• Ankle sprain 
  Pain in the lower leg can be caused by an ankle sprain.