What reason is dizziness when donating blood?

Look at your age. You have donated blood twice. You are a caring person.

You must eat before donating blood, but you must not donate blood when you are hungry and still undigested. Blood donation is prone to blood donation reaction under hypoglycemia.

A large part of human blood is supplied to the brain. When donating blood, the blood volume suddenly decreases and the blood supply to the brain is insufficient, which will temporarily cause dizziness. Coupled with hypoglycemia, it will cause blackness, tinnitus and dizziness. At this time, it is best to lie flat or lift your feet, which will soon be eliminated.

Will not affect health.

If you don't eat before 10 to 12 hours, there will be a serious blood donation reaction. Therefore, you must eat breakfast before donating blood, donate blood in the afternoon, have lunch and have a light diet.

Heart rate will be irregular when hypoglycemia occurs. If the heartbeat is abnormal at ordinary times, you'd better check it.

Ordinary young people, exercise more, will not have a big problem.

If you are not clear, go to Baidu to donate blood, where there are many blood donors who can communicate with you.