Why do people faint blood? Why do some people faint blood?

According to statistics, 3-4% of people have motion sickness or other related disorders, but its symptoms are completely different from other phobias, when people with motion sickness see blood, their blood pressure and heart rate will increase first and then decrease, while most other phobias only increase the heart rate.

It is generally believed that motion sickness is a phobia in which the object of fear is blood. In the American Diagnostic and Statistical Manual of Mental Disorders, it is classified as "blood injection injury phobia", indicating that the symptoms of motion sickness are similar to those of injection phobia and injury phobia.

John Sanford of Stanford University School of Medicine found that dizziness, syncope, and nausea caused by motion sickness are a vasovagal response (vagus nerve, a parasympathetic nervous system that extends from the brainstem through the neck, chest, and abdomen. It works by controlling the unconscious "heartbeat and digestion" function, which can help reduce heart rate, promote the secretion of gastric juice, etc.). The vagus nerve overreacts when the body is starving, dehydrated, standing up quickly, standing for a long time, laughing, startling, coughing violently, aching, vomiting, seeing blood, etc.

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Fainting from blood sickness is generally caused by an overactive vasovagal response, an evolutionary fear reflex. This response slows your heart rate, lowers your blood pressure, and causes blood to flow to your legs. This means that not enough oxygenated blood enters your brain, causing you to feel dizzy and even pass out.

When people with phobias are confronted with the object they fear, they do not simply have an increased heartbeat and blood pressure, because they initially appear to have an increase in heartbeat and blood pressure that then drops dramatically, often accompanied by vomiting, lightheadedness, and fainting.

It is a hysteria, which is an overreaction of the consciousness and body that occurs when you come into contact with or see or smell the blood. There are panic, palpitations, dizziness and other reactions in consciousness, and physiological and physical manifestations are increased blood pressure, increased heart rate, nausea, and limb weakness. Sickness actually originates from conscious activity in the cerebral cortex.

The brain sends instructions to secrete relevant hormones, resulting in physiological and somatic responses.

In the face of phobias, the most effective method is the exposure method, which also has almost the same effect on motion sickness. In recent years, on the basis of the exposure method, psychologists have developed an effective psychological technique called applying tension to deal with motion sickness (Peterson, 2004). In this method, the psychologist will tense up the person with the hemothmetry (e.g., clenching the fist to make the muscles tense), and then slowly let the patient see more and more blood (starting with a red dot, then a drop of blood, to showing a bloody **, etc.) until the patient is able to face the blood without fainting.

Answers compiled from Wikipedia, Science Park).

Why do some people get sick with blood?

Motion sickness is not an organic disease, but a psychological illness that belongs to one of the phobias.

Fear is one of the most primitive human emotions, and unlike anxiety, fear is an adaptive response to a real threat.

Anything that can pose a danger or threat to a person can trigger fear. People may develop phobia neurosis when they develop a sense of fear that is not in harmony with the actual danger in situations or situations that should not normally cause fear. There are three main types of phobias: place fear, social fear, and peculiar fear.

Sickness is a specific phobia. People with paraphobia are irrationally afraid of a specific situation or thing, and once exposed to the situation or confronted it, they will develop a severe sense of depression and fear. For example, fear of heights, hydrophobia, animal fear, etc., even if there is no threat, fear can occur.

Specific fears include fear of vomiting, fear of suffocation, and even fear of HIV infection. It usually begins at an early age, is more common in women, and rarely has other symptoms or syndromes. This disorder is the same phobia as the "object terror" of fear of seeing snakes and caterpillars, and the "communicative terror" of fear of seeing strangers and the opposite sex, and is not necessarily related to timidity.

Motion sickness is also different from motion sickness, the former is similar to fear of heights and is a psychological problem; The latter is a physiological problem of the balance organ of the inner ear. Although the cause of motion sickness has not yet been clarified, this mental disorder is certainly not the type of psychosis commonly known as "neuropathy". Except that they can't see blood, people who faint blood are no different from ordinary people.

Psychological problems, excessive tension when seeing blood will faint blood.

Relax when you faint, take a deep breath, and be quiet for a while.