Sympathetic excitation can lead to elevated blood pressure, and its main clinical manifestations include circulatory system manifestations, digestive system manifestations, respiratory system manifestations and urinary system manifestations. 1. Circulatory system manifestations: the main manifestations are increased heart rate, increased myocardial contractility, vasoconstriction of internal organs, skin, salivary glands and other organs, and increased blood pressure. 2. Digestive system manifestations: secretion of viscous saliva, weakening of peristalsis of the gastrointestinal tract and gallbladder activity, contraction of the sphincter of the digestive tract, and decrease in digestive and absorptive functions. 3. Respiratory system manifestations: reduction of organ and bronchial secretions, bronchial smooth muscle diastole, reduction of airway resistance. 4. Urinary system manifestations: bladder forced urinary muscle diastole, sphincter contraction, urinary urgency, decreased urination. In addition, it can also lead to pupil dilation, contraction of the skin erector spinae muscle, increased secretion of sweat glands, and elevated blood sugar. When patients experience elevated blood pressure, they must go to the hospital for examination to clarify the causes of elevated blood pressure and take measures to control blood pressure under the guidance of specialists, such as improving lifestyle and medication, to avoid adverse consequences.