Sympathetic nerve excitation can occur in the circulatory system, respiratory system, digestive system, urinary system and other systems of excitation or inhibition of the changes, excessive excitation can lead to dysfunction of the corresponding system. When the sympathetic nerve is excited, the circulatory system can be manifested as accelerated heartbeat, strengthened cardiac force, increased blood pressure, which can lead to the contraction of blood vessels in the abdominal viscera and skin endings, and vasodilatation of skeletal muscles. During sympathetic excitation, the respiratory system may be characterized by inhibition of bronchial smooth muscle activity, dilatation of small bronchial tubes, and increased ventilation. During sympathetic excitation, the digestive system may show slowing of gastrointestinal peristalsis and weakening of gastric juice secretion. During sympathetic excitation, the urinary system may exhibit relaxation of the bladder detrusor muscle and contraction of the internal sphincter, preventing the expulsion of urine. Sympathetic and parasympathetic nerves antagonize each other to maintain the normal function of the body systems. Sympathetic arousal is a normal physiological phenomenon that occurs when a person is under stress or strenuous exercise. Excessive excitation can lead to dysfunction of the corresponding systems, such as palpitations, hypertension, constipation, urinary retention, etc. When sympathetic excitation occurs, it is recommended to go to the hospital in time, to clarify the cause of the disease, and to be treated under the guidance of the doctor.