Increased sweating after exposure to cold is one of the symptoms of spinal cord cavitation. Spinal cord cavitation is a bizarre sweating phenomenon of increased sweating after exposure to cold, accompanied by a decrease in temperature, hyperkeratosis, atrophy and loss of luster of the fingertips and nails. Due to the loss of pain and temperature sensation, burns and bruises and trauma are likely to occur. In advanced stages, patients develop urinary and faecal disorders and recurrent urinary tract infections. The exact etiology of increased sweating after exposure to cold is unclear and can be divided into two categories: congenital developmental anomalies and secondary spinal cord cavitation, the latter being rare. 1, congenital atresia of the spinal cord neural tube: this disease is often accompanied by other congenital anomalies such as spina bifida, cervical ribs, scoliosis, and circumoccipital malformation support this view. 2, spinal cord blood circulation abnormalities: caused by spinal cord ischemia, necrosis, softening, the formation of cavities. 3, mechanical factors: congenital factors caused by the fourth ventricular outlet obstruction, cerebrospinal fluid flow from the fourth ventricle to the subarachnoid space is blocked, cerebrospinal fluid pulsation wave downward impact on the central canal of the spinal cord, resulting in the expansion of the central canal, and break through the central canal wall to form a cavity. 4, other factors: such as spinal cord tumor cystic degeneration, injury myelopathy, radiation myelopathy, spinal cord infarction softening, intra-spinal cord hemorrhage, necrotizing myelitis, etc.