Left leg lifting pain, may be related to physiological factors, may also be due to trauma, lumbar disc herniation, left sciatic neuritis and other reasons. 1. Physiological factors: for example, because of work, the left leg needs to step on the control board of the machine frequently, which will easily lead to excessive accumulation of lactic acid in the local muscles of the left leg, and may cause pain in lifting the left leg, which can be gradually relieved after resting. 2. Trauma: If the left leg is hit or struck by an external force, resulting in trauma to the left leg, resulting in damage to the local muscles and fascia of the left leg, it may cause pain in lifting the left leg, which may also be accompanied by localized swelling, bruising and other symptoms. 3. Herniated lumbar intervertebral disc: The herniated intervertebral disc can easily lead to localized nerve root compression, which may cause pain in lifting the left leg, and may be accompanied by numbness of the leg, lumbago and other symptoms. 4. Left sciatic neuritis: the human sciatic nerve is mainly composed of sacral and lumbar nerves, when the left side of the sciatic neuritis, under the stimulation of inflammation, it may cause pain in lifting the left leg, which may be accompanied by leg weakness, numbness and other manifestations. Left leg lifting pain, exclude physiological factors, other cases should be as early as possible to seek medical attention, clear causes, by the doctor’s guidance, treatment and adjustment, do not believe in prescription, so as not to aggravate the condition.