Left foot numbness and leg numbness, may be a long time squatting or single-leg overload caused by changing the posture, moderate activity, can promote blood circulation, leg and foot numbness symptoms can disappear. If there is no obvious cause for left foot numbness and leg numbness, consider related to cerebrovascular disease, lumbar spine disease, peripheral neuropathy and other causes. Patients should promptly undergo MRI examination of the head and lumbar spine to clarify the cause.1. Cerebrovascular disease: Due to the compression of the central nerve in the brain, patients have symptoms of left foot and leg numbness, and common cerebrovascular diseases include cerebral hemorrhage, cerebral infarction, intracranial aneurysm and so on. Patients should actively follow medical advice, medication and surgical treatment; 2, lumbar spine diseases: common such as lumbar disc protrusion, protruding disc compression of adjacent nerve roots, so that patients appear left foot numbness leg numbness symptoms. If the symptoms are mild, appropriate hot compresses and physiotherapy can be applied; if the symptoms are serious, surgery may be required; 3, peripheral neuropathy: common such as nerve endings, due to peripheral nerve blood circulation obstruction, blood can not reach the distal extremities, which in turn makes the patient appear the symptoms of left foot and leg numbness, can take methylcobalamin tablets, vitamin B1 and other drugs for treatment. You can also try acupuncture, massage and other Chinese medical methods to promote the recovery of limb function; 4, pear-shaped muscle syndrome: it can lead to the compression of the nerve in the left leg, which in turn causes numbness and pain in the legs and feet and other symptoms, which need to be treated with medication or small acupuncture treatment under the guidance of a doctor.