If intermittent pain in the thigh occurs on the anterior side, the most common is synovitis of the hip joint. Due to the inflammation of the synovial membrane, the joint cavity produces fluid and the pressure increases, which stimulates the compression of the foramen ovale nerve, causing pain on the anterior side of the thigh, and the pain of the nerve is intermittent and feels like a discharge. If it occurs on the posterior side of the thigh, the most common is sciatica, including radicular sciatica, such as disc herniation, and dry sciatica, such as pear-shaped muscle syndrome, both occur on the posterior midline of the thigh, from the hip to the popliteal fossa, with intermittent, discharge-like pain, and this pain is what we usually call neuralgia.