Uncomfortable left leg can’t say how to feel need to consider lumbar disc herniation compression nerve, femoral head ischemic necrosis, lower extremity vascular lesions, restless leg syndrome and other diseases. 1. Herniated lumbar intervertebral disc compressing the nerve: when the symptom is relatively mild, there may not be obvious numbness or pain, but there will be uncomfortable feeling such as heaviness and acidity in the leg. 2. Ischemic necrosis of the femoral head: the uncomfortable feeling of the leg may also appear in the early stage, especially the unilateral leg is more common. In this case, the discomfort can be relieved by applying hot compresses and keeping the groin area warm. 3. Varicose veins of the lower limbs: often after activity, the legs feel heavy and uncomfortable. 4. Restless Leg Syndrome: the discomfort in the legs is usually more pronounced at night when you sleep and can only be relieved after getting out of bed and moving around. There are many causes that can lead to discomfort in the left leg. It is recommended that when discomfort in the left leg occurs frequently, you should consult a doctor in time and receive appropriate treatment after a clear diagnosis.