Why do I feel dizzy when I suddenly stand up after lying down or squating for a long time, 14 years

If you squat on the ground for a little longer, and when you stand up suddenly, you often feel that the world is spinning and your eyes are full of stars. This is caused by temporary anemia of the head.

When a person is squatting, there are some special cases for the distribution of blood in the body. The first is that the two legs are pressed very tightly, the blood vessels are flattened, and the blood reaching the lower limbs is relatively small; Secondly, because the head is slightly tilted forward when squatting, the blood to the head is relatively more distributed.

When you stand up suddenly, the blood vessels in the lower limbs suddenly release the compression, so a significant part of the blood flows to the lower half of the body.

In addition, blood also has a certain weight in the body, and when you stand up suddenly, the blood flow will also flow to the lower half of the body due to the attraction of gravity and inertia, and the blood distributed to the upper body will be reduced. In addition, when standing up, the head is also upright, and it is more difficult to spurt blood from the heart to the high head.

All of this results in a relative decrease in blood flow to the head. The human brain is the most in need of blood oxygen, and a temporary reduction in blood supply can make people feel dizzy due to temporary cerebral anemia. In addition, due to the decrease in blood in the head, the blood supply to the eyeballs is naturally less, so the phenomenon of dazzling and Venus will occur.

Inadequate blood supply to the brain.

The simple principle is that most of the blood is in the lower body when squatting.

Fierce together.

The blood doesn't rise as fast as you get up.

A symptom that causes a transient lack of oxygen to the brain or how to drop... Stand up slowly.

Especially in the summer.

After squatting for a long time, when you suddenly stand up, you will be "dizzy", what is the reason for this?

Caused by insufficient blood supply to the brain It is recommended to slow down the movement as much as possible every time you want to get up Squatting for a few minutes and then standing up to feel dizzy and dizzy, most people will have it, as long as it can return to normal after a while, it is a normal physiological reaction, not a disease. If it takes a long time to return to normal, you should pay attention to it, such as anemia, hypoglycemia, cardiovascular disease, etc. Slender boys who are considered to have a "pneumothorax constitution" are mostly malnourished and have weakened immunity.

It is most likely to produce the symptoms of feeling dizzy and dizzy after squatting for a few minutes and then standing up. Is it normal to get dizzy when standing up after a long squat? When a person is in a squatting position, the lower limbs are in a flexion state, and the blood vessels of the lower limbs are compressed, so that the blood is not easy to flow to the lower limbs, and the lower limbs appear to be ischemia.

On the other hand, when a person who has been squatting for a long time suddenly stands up, the blood vessels of the lower limbs are restored to be unblocked, and then it is like suddenly opening the floodgates, and the blood will rush to the lower limbs in large quantities, so that the blood in the head is not enough, because the brain does not get enough oxygen and nutrition for a while, most people will have dizziness and heartbeat, but after the body adapts to it, this phenomenon will disappear quickly. Most of this phenomenon is a physiological phenomenon and is not caused by anemia. People with this phenomenon should not squat for a long time, if they have to squat often because of work, they can prepare a low stool or a small chair that can be folded in advance, and sit to reduce the flexion of the lower limbs; When standing up after squatting for a long time, it is advisable to stand up slowly to reduce the discomfort caused by this; People with this phenomenon should usually participate in more physical exercise to enhance cardiovascular function. Wish.

On the one hand, it has to do with physical health; On the one hand, it is natural, when people are squatting, the brain needs the blood supply capacity of the heart is low, so during this time, the heart has been supplying blood at a lower pressure, and when you stand up suddenly, due to the increase in the physical position of the brain, you need a higher pressure blood supply, but the heart can not adapt to this situation in a short period of time, so there is a blood supply tension, and you will be dizzy!

After squatting for a long time, you will feel dizzy and black, which is a normal phenomenon, which is caused by transient insufficiency of blood supply to the brain caused by squatting for a long time.

Therefore, in this case, it is recommended to stand slowly when standing, so that the blood supply to the brain has a certain time transition, and usually do not squat for a long time.

If this phenomenon occurs frequently, it is recommended to measure blood pressure to see if there is hypotension or to perform a cranial and cerebrovascular ultrasound to see if there is insufficient blood supply to the brain.

Regular exercise should be done to strengthen prevention and health care.