I fell off my bike and got really nauseous and dizzy. Why?

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poopilypoop

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I hopped off my bike in order to stop myself from hitting my friend and I landed on my hands. I slightly tapped my head on the ground. A small scrape is all I received, no pain. When I got up I was really dizzy, nauseous, felt flushed, and my hearing was going in and out of my ears. Also, my hands got really cold suddenly (though I think thats just from the trauma they received, not related to the other symptoms). I got back on my bike and started riding and I felt better after a few minutes. Im fine, but I am just curious as to what caused all that. Was it just a big adrenaline rush? Was it just all the getting shakin up? I didnt really get that shakin up though, like I said I kinda jumped off my bike and tripped onto the pavement at a relatively slow speed. Tell me oh wise yahoo answers, what caused all that funkiness!?!
 
You might have had a mild concussion.
Headache is the most common MTBI symptom.[18] Other symptoms include dizziness, vomiting, nausea, lack of motor coordination, difficulty balancing,[18] or other problems with movement or sensation. Visual symptoms include light sensitivity,[30] seeing bright lights,[29] blurred vision,[11] and double vision.[31] Tinnitus, or a ringing in the ears, is also commonly reported.

Or it was just release of stress hormones:
...Although epinephrine does not have any psychoactive effects, stress or arousal also releases norepinephrine in the brain. Norepinephrine has similar actions in the body, but is also psychoactive.

As a stress hormone, norepinephrine affects parts of the brain where attention and responding actions are controlled. Along with epinephrine, norepinephrine also underlies the fight-or-flight response, directly increasing heart rate, triggering the release of glucose from energy stores, and increasing blood flow to skeletal muscle.
 
You might have had a mild concussion.
Headache is the most common MTBI symptom.[18] Other symptoms include dizziness, vomiting, nausea, lack of motor coordination, difficulty balancing,[18] or other problems with movement or sensation. Visual symptoms include light sensitivity,[30] seeing bright lights,[29] blurred vision,[11] and double vision.[31] Tinnitus, or a ringing in the ears, is also commonly reported.

Or it was just release of stress hormones:
...Although epinephrine does not have any psychoactive effects, stress or arousal also releases norepinephrine in the brain. Norepinephrine has similar actions in the body, but is also psychoactive.

As a stress hormone, norepinephrine affects parts of the brain where attention and responding actions are controlled. Along with epinephrine, norepinephrine also underlies the fight-or-flight response, directly increasing heart rate, triggering the release of glucose from energy stores, and increasing blood flow to skeletal muscle.
 
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