The left thalamus mainly controls sensations in the right limb, such as pain and fine touch pressure sensation, and is also associated with emotion and level of consciousness. The thalamus is the center and relay station of various sensory transmissions, and the left thalamus is generally in charge of sensation in the right limb. If the left thalamus is damaged, sensory impairment in the right limb will generally occur, and there may also be ataxia brought about by sensory impairment, and a small number of patients may also experience spontaneous pain in the right limb, and develop affective disorders, which are mainly characterized by emotionally unstable or forceful crying and laughing. The cooperation of the non-specific projection system of the thalamus and the upward reticular activation system of the brainstem can maintain the excitability of the cerebral cortex, so if the thalamus is damaged, different degrees of consciousness disorders may occur.