The prognosis of Horner’s syndrome varies depending on the cause of the disease. In terminal Horner’s syndrome, there is hope for a cure, and treatment, regardless of symptoms, is simply topical administration of 1%-2% epinephrine, administered three times daily to the eyes. Although symptoms such as droopy eyelids, constricted pupils and protruding transepithelium can be relieved quickly, continuous medication should be given during the 4-5 weeks of sympathetic recovery, and in cases caused by trauma, it takes 6 weeks-3 months to improve the symptoms. Precautions for the prevention and treatment of Horner’s syndrome: 1. There is only hope for cure when terminal Horner’s syndrome is present. Treatment, regardless of symptoms, is simply local administration of 1 to 2% epinephrine, with eye dots 3 times daily. 2. Although symptoms such as ptosis, constricted pupil and prominent transepithelium can be relieved quickly, the sympathetic nerve has to be given continuously during 4~5 weeks of recovery, and if it is caused by trauma, it takes 6 weeks-3 months to improve the symptoms. 3. Actively treat primary diseases that may involve the sympathetic pathway for early diagnosis and treatment.