There are many reasons why it is difficult for two legs, and the common reasons can be divided into physiological reasons, such as standing for a long time, sitting for a long time, cold, etc., as well as pathological reasons, such as lumbar intervertebral disc herniation, meniscus injury, rheumatoid arthritis and so on. Physiological causes: 1, sedentary: long standing or sedentary easily lead to deep vein valve insufficiency in the lower limbs, causing poor local venous return, resulting in the phenomenon of the two legs, adequate rest can relieve the symptoms, without special treatment; 2, cold: when the weather cools down, did not add clothes in a timely manner, or sleep cold, will make the leg muscles can not be fully relaxed by the cold invasion will lead to the local production of lactic acid, as well as metabolic products gradually increased. Lactic acid, as well as the gradual increase in metabolic products, the peripheral nerves around the stimulation, the emergence of two legs difficult, you can promote blood circulation through hot compresses to alleviate the symptoms. Second, pathological reasons: 1, lumbar intervertebral disc herniation: refers to the lumbar intervertebral disc degenerative changes, under the action of external forces, part or all of the annulus fibrosus rupture, individually or together with the nucleus pulposus, cartilage end plate protrudes outward, stimulation, compression of the sinus nerve and nerve root, can be radiated to the lower limbs, causing leg muscle spasm, ischemia, resulting in two legs difficult. It is recommended that patients take bed rest, use non-steroidal anti-inflammatory drugs under the guidance of the doctor, such as diclofenac sodium extended-release tablets, ibuprofen, etc., but also use methylcobalamin tablets and other nutritive nerve medications, if the drug treatment is ineffective, consider surgical treatment, such as lumbar herniated disc resection; 2, meniscus injury: meniscus is a pair of half-moon shaped fibrous cartilage located in the inner tibial bone, lateral condyle articular surfaces, patients with abnormal movement, trauma, can occur meniscus, and the meniscus will be affected when they are in the hospital. Meniscus injury occurs when the patient suffers from abnormal movement or trauma. It is difficult to repair the meniscus after the meniscus injury, and the meniscus can not move with the movement of the knee joint, therefore, when the patient has meniscus injury, the phenomenon of two legs will be difficult to bear, accompanied by swelling, limited activities, etc., you can use non-steroidal anti-inflammatory drugs under the guidance of the doctor, such as diclofenac sodium extended-release tablets, ibuprofen, etc., and if you can’t relieve the symptoms, you need to carry out surgical treatments, such as meniscus repair surgery, etc.; 3, rheumatoid Arthritis: will make the synovial membrane of the joint congestion, edema, inflammatory cell infiltration, can stimulate the periarticular nerve, thus appearing the phenomenon of two legs, patients can use prednisolone tablets under the guidance of the doctor for anti-rheumatic therapy, when the pain is serious, you can take non-steroidal anti-inflammatory drugs, such as diclofenac sodium extended-release tablets, to play an anti-inflammatory, analgesic effect, but also through the grill, microwave and other physical therapy to improve the symptoms.