why do you pass out after giving blood

Blood donation has several benefits for those who have serious injuries and diseases. The Mayo Clinic reports that each blood donation can help up to three people since donor centers divide whole blood into platelets, red blood cells and plasma. Because donation involves the removal of blood from the circulatory system, some people pass out while giving blood or after the blood donation process. During the donation process, a phlebotomist or nurse inserts a needle into the vein of the donor. The collection process itself takes 8 to 10 minutes, according to the American Red Cross. Blood collection continues until 1 pint of blood has accumulated. After this procedure, the phlebotomist or nurse puts a bandage on the donor rsquo;s arm to stop any bleeding. During the blood collection process, blood volume decreases, causing a sudden drop in blood pressure. This sudden drop causes some people to pass out while they give blood. Sudden decreases in blood sugar level also cause fainting during blood donation. "Men rsquo;s Health" magazine indicates that blood donation also has an emotional component.


During emotional stress, the body directs blood flow to the muscles to prepare for the flight or fight response to danger. This diverts blood from the brain, increasing the risk that someone will pass out during the donation process. Some people experience symptoms before they pass out. The Heart Rhythm Society defines these symptoms as presyncope. Presyncope symptoms include sweating, nausea, lightheadedness, dizziness, abdominal discomfort, headache, confusion, heart palpitations and difficulty speaking. If you experience these symptoms while donating blood, notify a donation center professional immediately. Blood donors should take several steps to reduce the risk of passing out during the donation process. The American Red Cross recommends drinking plenty of fluids and maintaining a diet high in iron before a donation appointment. Drinking fluids will keep blood volume at normal levels, while iron consumption will counteract the loss of iron that occurs during donation. After giving blood, eat a snack that contains sugar to replace the blood sugar lost during the donation process.


This will help prevent fainting after blood donation. Some people have an increased risk for passing out because of medical conditions that affect the heart, endocrine system and nervous system. These conditions include diabetes, hypoglycemia, anxiety, irregular heartbeat, panic disorders, heart blockages and dehydration. Discuss your medical history with a physician or donation center representative to determine if blood donation is appropriate.
-Went to be a good person and donate blood since I got that most valuable blood type O negative. -felt great (like I always have) after donating and went next door to get my hair cut. my barber is right next door to blood bank so it's kinda my routine. -everything's fine, and I'm chatting away w/ my barber, but then I started feeling light headed, hot and super dizzy. -was going to try and hold off the weird feeling since he was almost done w/ my hair, but couldn't stand it anymore so I asked him if I could get up and walk around and told him that I donated blood. -I dun goofed by standing I think, so I sat right back down.


Barber got me a cool towel to put on my neck and some cold 7up to drink (he's a nice guy). -I was pretty embarrassed and felt weird and I just didn't want to be there anymore so I asked him if I could pay and told him I was going to go sit in my truck. -All I remember was walking toward the pay counter and then next think I know I'm looking up and my barber is standing over me a long with a nurse from the blood bank. -It was weird and I don't remember passing out, but I somehow knew that's what happened. They kept wanting to call 911, but I said no and had my GF come get me. Still don't feel 100% and I don't know why everything is so bad considering I've never felt bad after donating blood. I always feel just fine. Anyone else ever pass out or feel really bad after donating? p. s. I don't think I hit my head, supposedly some lady caught me. Oh and I got a free haircut, he refused to charge me after my gf got there. So I'm deff going to give him a $40 dollar tip next time for sure.

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