Sympathetic nerve disorder may affect the heart with accelerated heart rate, arrhythmia, and increased myocardial contractility. 1. Accelerated heart rate: the heart is innervated by sympathetic nerves, vagus nerves and parasympathetic nerves. When the sympathetic nerves are dysfunctional, causing the release of adrenaline, which strengthens the myocardial activity, it is easy to have an increased heart rate, accelerated heartbeat, and so on. 2. Arrhythmia: When the vegetative nerves are disturbed, the sympathetic nerves innervating the heart will also be disturbed, resulting in premature beats and arrhythmia, which are manifested as palpitations (accelerated heartbeat, often accompanied by panic), dyspnea, sweating, chest tightness, and so on. 3. Increase in myocardial contractility: the sympathetic nerve releases catecholamines, which can excite the adrenergic receptors of myocardial cells. Sympathetic nerve excitement can lead to an increase in myocardial contractility and a decrease in myocardial refractoriness, which can lead to dizziness, headache, palpitations (accelerated heartbeat, often accompanied by panic) and other symptoms. If the sympathetic nerve disorder produces obvious discomfort to the body, you should seek medical advice and treatment under the guidance of a doctor.