Why do people faint for no reason, and why do people faint suddenly?

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There can be a variety of reasons why a person can faint, and here are some of the common ones:

1.Low blood pressure: When blood pressure drops suddenly, it can lead to reduced blood flow and a lack of oxygen to the brain, causing syncope. Causes of a drop in blood pressure can include prolonged standing, starvation, dehydration, taking medications, etc.

2.Bradycardia: Bradycardia: Bradycardiac or tachycardiac may cause a lack of blood**, which can cause focal spinal syncope. For example, rapid movement in certain sports, patients with unstable heart rate, etc.

3.Hypoglycemia: Low blood sugar can also lead to syncope in cases of prolonged starvation, insufficient insulin secretion, etc.

4.Brain problems or neurological problems: Fainting can also be caused by brain problems**, traumatic brain injury, epilepsy or other neurological disorders.

5.Panic or overexcitement, pain, blood loss, anemia, suffocation, and poisoning may also cause syncope.

It is important to note that even if the symptoms of syncope do not appear to be severe on the surface, it may hide more important health problems, so it is recommended to go to the hospital for further testing and ** in the event of syncope.

It generally refers to sudden fainting, also known as fainting or syncope. Fainting is a sudden and transient loss of consciousness that lasts from a few seconds to a few minutes, and the onset is caused by a temporary lack of blood or oxygen supply to the brain, and the recovery is relatively fast. Coma, on the other hand, is a prolonged loss of consciousness that makes recovery slow and difficult.

The causes of fainting are: 1 Reflex syncope: 1 Vasosuppressive syncope - the most common, accounting for more than 50%.

Syncope is often induced by fatigue, fasting, poor ventilation, and mental factors (nervousness, fear, pain); Prodromal symptoms such as transient dizziness, dizziness, weakness, and limb weakness before syncope; Syncope is accompanied by slowed heartbeat, decreased blood pressure (reflexive increase in the later stage), paleness, etc., and the recovery is rapid without obvious sequelae. 2 Orthostatic hypotension - often occurs when the supine position is converted to an upright position, and can also occur when standing for a long time, and the blood pressure drops during syncope without obvious changes in heart rate.

3 Micturition syncope - mostly in young and middle-aged men, syncope often occurs during or after urination. 4 Carotid sinus syncope – seen in middle age and above, syncope is associated with a sudden turn of the head. 2. Cardiac syncope:

Patients often have a history of heart disease, which is often caused by severe arrhythmias, such as high tachycardia, bradycardia (less than 40 points) or asystole, valvular heart disease, obstructive cardiomyopathy, atrial myxoma, etc., resulting in cerebral insufficiency and syncope. 3. Cerebral syncope: Common cerebrovascular diseases such as cerebral arteriosclerosis, cerebral vascular stenosis or obstruction, transient cerebral ischemia, pulseism, epilepsy, craniocerebral injury, etc.

4. Metabolic and hematologic syncope: Hypoglycemic syncope is common, the seizures are related to fasting, and can also occur 2 to 4 hours after a meal, syncope often occurs slowly, and recovery is also slow. There is no significant change in blood pressure and pulse at the time of attack, and blood glucose levels often do not match symptoms.

Severe anemia can also cause fainting. 5. Psychogenic syncope: seen in hysteria, hyperventilation, etc.

Your discomfort symptoms are considered to be.

Inadequate blood supply to the brain.

Please refer to mine for details.

space, which has detailed instructions (1, dizziness and headache are difficult to treat. 2. Dizziness and headache patient's life

Self-care. NOTICE).

Good luck with a speedy recovery!