Foot brace pain is also known as pain in the arch of the foot. Pain in the arch of the foot may be caused by abnormalities in the arch of the foot, or it may be caused by low back disorders. 1. Foot arch abnormality: foot support is a common saying, clinically it is generally called foot arch or plantar, congenital or acquired causes of foot arch morphology and structure abnormality, it will lead to walking or running when the arch of the foot is subject to excessive pulling and stimulation or spasm and tension and so on, which will cause the symptoms of pain in the arch of the foot, such as flat feet, high arched feet, and so on. 2. Lumbar diseases: Lumbar diseases can produce pressure or stimulation on the nerves innervating the plantar area, resulting in abnormal sensation or movement of the plantar area, which may be caused by lumbar degenerative disease resulting in lumbar disc herniation, or due to age increase, the soft tissue around the vertebrae holding power decreases resulting in lumbar vertebral spondylolysis and so on. Sometimes the symptoms of foot pain alone cannot accurately determine the cause, but also need to be combined with the characteristics of the medical history, other test results to make an accurate judgment, it is recommended to clarify the cause of the disease under the guidance of a doctor.