Why can t some people donate blood, and what is the reason for dizziness when donating blood?

Blood donors are demanded. First of all, the age is 18 to 55 years old, which is the rule in China, followed by weight, more than 45 kg for girls, more than 50 kg for boys, followed by health status, no recent illness and antibiotics, etc., and whether there is any other major history of illness.

Dizziness when donating blood may be due to insufficient blood**, or not eating, etc., and it is normal to have a slight matter.

Hehe, I have donated blood myself and am also a volunteer, I hope it will help you.

Whether this is related to your physical health, for example, if you have an infectious disease such as hepatitis B, etc., you must not have blood, that is, others don't want it, dizziness is because your body is a little anemia, and if you donate more, there will be insufficient blood supply to the brain, and you will be dizzy.

Fainting refers to the phenomenon of fainting caused by the sight of blood, which is mainly manifested as dizziness, nausea, dizziness, palpitations, followed by paleness, cold sweat, cold limbs, decreased blood pressure, weak pulse, and even sudden loss of consciousness. The patient should first be placed on a flat line, fed warm water or sugar water, rested for 10 to 15 minutes, and generally recovered, and if necessary, should be given medication to resuscitate**.

Motion sickness, also known as "hemophobia", is a mental disorder in a special situation, which 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.

Those who suffer from fainting will feel terrible and nauseous when they see blood; In severe cases, they will lose consciousness. These problems may affect the patient's work and life. However, motion sickness is not an incurable disease, and if the disease is "desensitized"** (blood is seen repeatedly and gradually from weak to strong under the guidance of a psychologist), it can be **.

No, such people are not allowed to donate blood, because it is easy to faint, and there is no way to donate blood normally.

People with faint needles are not advised to donate blood. Sickness may also occur when donating blood. What should people who get sick do if they want to donate blood? When participating in the blood donation site, you must relax and not be too nervous, especially if you have blood sickness or fainting needles before, you must adjust your mentality.

Blood donation is a very meaningful public welfare activity, now many young people with good physique are willing to donate blood for free, but some people will feel dizzy and nauseous after donating blood, at this time they will feel very scared, today I will tell you why they feel dizzy and nauseous after donating blood.

1. When a person donates blood, it may be due to the decrease in blood volume of the body caused by the decrease in blood pressure, and then cause posterior circulation ischemia, at this time, the patient may have symptoms and signs of cerebellar brainstem ischemia, manifested as dizziness, nausea and vomiting, and the patient will also be accompanied by tinnitus, deafness and visual dizziness and other symptoms from time to time.

2. Dizziness after blood donation may be due to the patient's mental tension caused by the patient's mental tension after blood donation, causing an increase in blood pressure, and after the blood pressure rises, the patient will have dizziness, nausea, and vomiting, so if the patient's blood pressure rises, he should be given antihypertensive drugs in time to alleviate it.

3. The change of blood volume and the regulatory function of the human body are not synchronized. When the human body loses blood, the body will redistribute blood to various organs, first from the heart and brain, if the body's ability to regulate is not good, there may be symptoms of dizziness, for this change in blood volume, everyone's reaction is different, some people adjust quickly, there is no adverse reaction after writing, but some people have poor adjustment ability, they will feel dizzy and nausea, which is a normal phenomenon.

Blood donation is a very loving thing, and blood donation is also very encouraged in our country, but before donating blood, you must remember not to take medicine, because if you take certain drugs, it may reduce some functions of platelets within three days, and you should also reduce fat intake in your diet before donating blood, and eat according to your previous habits the day before donating blood, mainly on a low-fat diet, do not drink alcohol, especially do not drink strong alcohol, and ensure adequate sleep. Go to bed early and get up early and don't do strenuous exercise.

It may be caused by poor physical fitness, or by the loss of a large amount of blood, or by low blood pressure, or by blood loss, or by being too nervous.

It may be because you donate too much blood and your body is relatively weak, so this dizziness and nausea will occur, in fact, this is not a serious disease, you need to eat some blood-replenishing food.

It is related to low blood volume, because if you only donate 200cc of blood, these symptoms will not appear, and only a large amount of blood donation will cause dizziness and nausea.

After donating blood, I will feel dizzy and vomiting: No, I have donated almost 30,000 milliliters of blood and I have never felt it: