Usually, numbness in the lateral thighs is caused by poor posture after sitting for a long time, but if it lasts for a long time, occurs frequently and is associated with mild pain, it may be caused by pathological factors. The common causes of lateral thigh numbness are: rheumatism-related diseases, lumbar disc herniation, lateral femoral dermatomal neuritis, etc. 1, rheumatism-related diseases: some people will have numbness in the outer thighs in rainy weather, which may be caused by rheumatism-related diseases, especially women, need to go to the hospital a, and pay more attention to keep warm in life, to prevent the legs from getting cold, leading to aggravation. 2, lumbar disc protrusion: some patients due to lumbar disc protrusion caused by compression of the relevant thigh nerve, thus appearing numbness. This needs to go to the hospital to do a lumbar spine nuclear magnetic, electromyography examination, and then for the cause of treatment, in addition to life often hot compress massage legs and lumbar, can be effective relief. 3, lateral femoral dermatome neuritis: is the most common cause of lateral thigh numbness, anxiety and tension aggravated, when the numbness can be appropriate to do hot compresses to relieve the situation, but also can take some nerve nutrition drugs. The causes of lateral thigh numbness are mainly the above three, patients need to go to the hospital to do a detailed examination, targeted medication to get effective treatment.