Sympathetic nerve is a kind of autonomic nerve, which controls our heartbeat, blood pressure, whistling, heartbeat, etc. People with autonomic dysregulation, that is, people with high sympathetic nerve activity, resulting in tight nerves or tight tendons, if tight in the chest, it produces chest tightness, chest tightness pain, so that cardiovascular delivery is poor; if tight in the heart, it produces depression, anxiety, nervousness, anxiety, etc., and feel stressed at all times. Human tendon tightness or sympathetic nerve activity is too tight. People with habitual tendon tightness are prone to make sympathetic nerve tightness; conversely, people with high sympathetic nerve activity are also prone to make the tendons of the head, chest and heart tight, which affect each other. The differential diagnosis of chest tightness: 1, the whole body tightness The whole body tightness is one of the clinical symptoms caused by the disease of organophosphorus pesticide poisoning. Nicotine-like symptoms in the clinical manifestations of organophosphorus pesticide poisoning: generalized tightness, slurred speech, tremor of the chest, upper limbs, face and neck and even the whole body muscle bundles, chest compression, frequent heartbeat, increased blood pressure, and respiratory paralysis in severe cases when the condition worsens. Organophosphorus pesticides can enter the body through the digestive tract, respiratory tract and intact skin and mucous membranes. Occupational pesticide poisoning is mainly caused by skin contamination. The absorbed organophosphorus pesticides are distributed in various organs in the body, with the largest content in the liver and the content in the brain depending on the ability of the pesticide to penetrate the blood-brain barrier. The main mechanism of organophosphorus pesticide poisoning is the inhibition of cholinesterase activity. Organic phosphorus and cholinesterase combined to form phosphorylated cholinesterase, so that cholinesterase lost the role of catalytic acetylcholine hydrolysis, the accumulation of acetylcholine to choline has two effects on the nerve: muscarinic effect and nicotinic effect. 2, tension fatigue Long-term tension in the state, resulting in fatigue of the body in a subhealthy state, the serious formation of tension sleep disorder. 3, chest urgency or band feeling Peripheral blood leukocyte count is normal or slightly high, caused by bacteria or combined with bacterial infections can be significantly higher. x-ray examination of the lung texture thickening or lung door shadow deepening. 4, tension Tension is the body in the mental and physical aspects of the strengthening of the response to external things. Good changes, such as marriage, children; bad, such as divorce, waiting for a job, day after day will make people nervous. The degree of tension is often proportional to the size of life changes. Tension causes sleep disturbance, inability to think and concentrate, headache, heart palpitations, abdominal and back pain, and fatigue. Ordinary nervousness is temporary. Sudden nervousness is a feeling of fear.