I keep fainting, does anyone know any advice they can give me?!

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Fainting is pretty common in teens. The good news is that most of the time it's not a sign of something serious.

When someone faints, it's usually because changes in the nervous system and circulatory system cause a temporary drop in the amount of blood reaching the brain. When the blood supply to the brain is decreased, a person loses consciousness and falls over. After lying down, a person's head is at the same level as the heart, which helps restore blood flow to the brain. So the person usually recovers.

?Physical triggers. Getting too hot or being in a crowded, poorly ventilated setting are common causes of fainting in teens. People can also faint after exercising too much or working out in excessive heat and not drinking enough fluids (so the body becomes dehydrated). Fainting can also be triggered by other causes of dehydration, as well as hunger or exhaustion. Sometimes just standing for a very long time or getting up too quickly after sitting or lying down can lead someone to faint.

?Emotional stress. Emotions like fright, pain, anxiety, or shock can affect the body's nervous system, causing blood pressure to drop. This is the reason why people faint when something frightens or horrifies them, like the sight of blood.

?Hyperventilation. A person who is hyperventilating is taking fast breaths, which causes carbon dioxide (CO2) to decrease in the blood. This can make a person faint. People who are extremely stressed out, in shock, or have certain anxiety disorders may faint as a result of hyperventilation.

?Drug use. Some illegal drugs — such as cocaine or methamphetamine — can cause fainting (and even a heart attack in some cases). Inhalant use ("huffing") can lead to fainting by causing problems with a person's heartbeat. Fainting is also a side effect of some prescription medications.

?Low blood sugar. The brain depends on a constant supply of sugar from the blood to work properly and keep a person awake. People who are taking insulin shots or other medications for diabetes can develop low blood sugar and pass out if they take too much medicine or don't eat enough. Sometimes people without diabetes who are starving themselves (as with crash dieting) can drop their blood sugar low enough to faint.

?Anemia. A person with anemia has fewer red blood cells than normal, which decreases the amount of oxygen delivered to the brain and other tissues. Girls who have heavy periods or people with iron-deficiency anemia for other reasons (like not getting enough iron in their diet) may be more likely to faint.

?Pregnancy. During pregnancy the body normally undergoes a lot of changes, including changes in the circulatory system, which can cause a woman to faint. In addition, the body's fluid requirements are increased, so pregnant women may faint if they aren't drinking enough. And as the uterus grows it can press on and partially block blood flow through large blood vessels, which can decrease blood supply to the brain.

?Eating disorders. People with anorexia or bulimia may faint for a number of reasons, including dehydration, low blood sugar, and changes in blood pressure or circulation caused by starvation, vomiting, or overexercising.

?Cardiac problems. An abnormal heartbeat and other heart problems can cause a person to faint. If someone is fainting a lot, especially during exercise or exertion, doctors may suspect heart problems and run tests to look for a heart condition.

Some medical conditions — like seizures or a rare type of migraine headache — can cause people to seem like they are fainting. But they're not the same thing as fainting and are handled differently
If you think you're going to faint, you may be able to head it off by taking these steps:

?If possible, lie down. This can help prevent a fainting episode as it allows blood to circulate to the brain. Just be sure to stand up again slowly when you feel better — move to a sitting position for several minutes first, then to standing.

?Sit down with your head lowered forward between your knees. This will also help blood circulate to the brain, although it's not as good as lying down. When you feel better, move slowly into an upright seated position, then stand.

?Don't let yourself get dehydrated. Drink enough fluids, especially when your body is losing more water due to sweating or being in a hot environment. Drink enough fluids before and during sports and exercise.

?Keep blood circulating. If you have to stand or sit for a long time, periodically tense your leg muscles or cross your legs to help improve blood return to the heart and brain. And try to avoid overheated, cramped, or stuffy environments

http://kidshealth.org/teen/your_body/hea…

There could be loads of reasons why.
It could be your period, it could have something to do with anemia. Could you possibly be pregnant? I fainted last year and the paramedics came and asked if I was pregnant, but it was anemia. Anemia is something where you don't have enough iron, to put it simply. If you have that, all you need to do is to eat more stuff with iron in them.
It could just mean that you get dizzy sometimes (does it happen when you get up?). I have to get up slowly, so my body has time to adjust. Like when I'm sitting down, or I've just woken up.
There's more information in the source.

http://www.nhs.uk/Conditions/Fainting/Pa…

Don't mess around getting answers from people who may not know what they are talking about.

Something is wrong, go and talk to a professional. Take yourself to your doctor's surgery or (depending where you are living) A&E at a hospital.

And how are you qualified to know whether smoking is responsible or not. Smoking kills, that is unarguable... except by pro-smoking lobbyists.

Fainting can be a sign of pregnancy, take a pregnancy test if that comes back negative then you need to get yourself down the doctors and he will probably send you for a blood test to rule out a few things but it's no good asking on here you need professional advise.

Doctor - you need to make sure it's not a symptom of something serious. Short term, make sure you get plenty of iron in your diet.

See a doctor. I would guess low blood pressure, if correct eat more green vegetables for iron .