The inexplicable pain in the leg needs to be considered due to fasciitis, lumbar disc herniation, calcium deficiency and other reasons. 1. Fasciitis: If the patient stands for a long time or wears too many clothes, the legs are cold and other reasons cause fasciitis disease, resulting in local soft tissue damage, the symptoms of inexplicable pain in the legs may occur. 2. Lumbar disc herniation: when suffering from lumbar disc herniation, the protruding nucleus pulposus may compress or stimulate the nerve root, which may cause radiating pain in the innervated lower limbs, that is, the symptom of inexplicable pain in the legs. 3. Calcium deficiency: When there is a lack of calcium in the body, it may cause abnormal excitation of the skeletal muscles or abnormal spasm or contraction of the leg muscles, which will lead to inexplicable pain in the legs. When the symptoms of inexplicable pain in the legs, you also need to consider whether there are leg bone tumors, fractures, varicose veins and arterial embolism and other diseases, it is recommended to go to the hospital in time to find out the cause of the disease, and under the guidance of a professional doctor to carry out targeted treatment.