Lately I've been extremely light headed need help?

[everydaynormalguy]

I've started riding a bike more often i cycle a few miles a day but everytime i get out of bed, go fast or even sit up i get light headed and almost fade out, what could this be. im 16 if it helps

[redeyemindtricks]

I like this -- it's like a game show. It's like playing Name That Tune with just the first two notes, lol. (Yep, Name That Tune... I'm THAT old, I actually remember that show.)

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What yr experiencing is a symptom of low blood pressure.

If I had to guess -- based on ONLY the information that you've provided -- I'm gna guess that you have not increased yr intake of electrolytes (sodium + potassium) to make up for the extra that yr losing through yr increased exercise level.

Have you...
... begun to eat more salty foods, since you started biking more?
... been drinking some sort of electrolyte replacement drink (like gatorade) during and/or after yr bike workouts, if not?

If you haven't been doing either of these things, then, that's the problem -- yr electrolyte levels are dropping, and in yr sleep they are reaching such low levels that you are blacking out upon waking up.

Have you been doing at least one of those things? More salty food, and/or drinks that replace electrolytes?

[Vtachy]

Sounds like orthostatic hypotension. Which could just be that you do normally have a blood pressure on the lower side of normal, but it could also indicate other illnesses. If it keeps up I'd just check in with your doctor to let them know whats going on, they may end up doing some blood work to rule things out. If you happen to have a blood pressure machine at home, take your blood pressure sitting, lying, and standing and compare the values.

[meowcow]

There's nothing wrong with you. You are simply experiencing a rapid decrease in blood pressure going to your brain.

When you are lying down or sleeping, your heart does not need to work as hard to pump blood throughout your body. It's easier to push blood through your body when you are sideways. And when you're sleeping, your heart rate is even lower.

When you suddenly stand up from this position, gravity draws the blood down and away from your brain. At the same time, your heart has not been given time to adjust, so you may feel light-headed or even pass out and fall to the ground. The feeling only lasts a short time, like 30 seconds. This can also happen in a seated position.

All you need to do is sit up, stretch and twist your upper torso around a few times to get your body moving and your heart pumping a bit faster before standing up.

[Cusco_Othriyas]

You might want to check with a doctor. It could simply be blood having trouble getting to the brain as you're getting up too quickly or something worse.

[Anonymous]

That just happens sometimes if you get up too fast. Google it. If you're worried or have any other symptoms though, see a doctor.