Alright so you would basically have to do it non stop constantly for minutes. And even then, concussion like symptoms occurring doesn't necessarily mean an actual concussion has happened? Rather a severe disturbance of blood flow or inner ear?

Nobody said anything about a severe disturbance of blood flow. More likely a common but momentary change in blood flow.

Minimac, you're most definitely allowing your anxiety/obsession to take hold, and I'm confident that this worrying poses a far greater risk to your health than anything that you have done with your head as of late. Trust me; I've been trying to get over the very same mental obstacle for the past year, and I'm still not quite there yet.

For example, a part of me still thinks that I'm experiencing concussion symptoms as a result of a particularly "vigorous" activity from earlier this week... I don't quite know how to say it on this forum, but yeah. Sure, it caused my head to jerk around a bit, and—even despite the fact that I've had far too many alcohol-related concussions within a very short timespan (recently, too)—I have to keep telling myself that I'm fine.

As of this past pseudo-incident, hitting the books intensely for a few hours will cause me to feel a pressure sensation in my head, but I'm able to make it disappear instantly by simply relaxing my cranio-facial muscles. Now and then I'll notice what seems to be tinnitus—no, now and then I'll resolutely convince myself that I'm experiencing this hallmark symptom of concussion, but then I tell myself that I've always heard this noise, that even my healthy brain had regularly perceived this kind of sound.

You'll be fine. People keep on learnin', world keeps on turnin'. You're ten years post-concussion, and you've only had one...I remember hitting my head pretty hard only 10 or so months after my initial concussion as a kid, and I was fine. In fact, before my more recent "set" of alcohol-related concussions, I busted up my teeth (and my face) on some ice without cognitive deficit.

Persistence is great in the pursuit of knowledge, and I'd encourage you to go explore the scientific literature ad nauseam (if that's your thing), but obsession and incessant self-projection will eat you alive.

Cheers!

Yesterday evening, I had a really strange experience. I walked pretty fast through an open door, because my food was ready. I wasn't catious enough due to beein in a hurry and snaged with my left under arm on the left door frame. This resulted in a very fast turn of about 90 degrees of my whole body. The head itself did not move the full 90 degrees, because of the necks rotational ability(I hope you know what I mean here).

In conclusion, this incident resulted in extreme fatigueness a few minutes after it happened. I was so tired that I fell asleep. Today I'm still a bit dizzy. Actually, I have no explanation of this. I also don't know wether this can be called a subconcussive impact, as the head itself didn't hit anywhere.

Chris,

First, subconcussive impacts have a cumulative effect when one suffers hundreds of them over a few months. One infrequent impact is not a big deal.

Did you fall sleep before or after your meal ? If after, it could be because you meal caused an increase in blood sugar. This can cause drowsiness and sleep.

A short bout of anxiety from the "Did I hurt myself bumping into the wall?" thought can also cause sleepiness.

I fell asleep after meal, but nonetheless I'm pretty sure it had to do something with the impact. I also get this feeling when I bump my head slightly. Not sure where it is coming from but look at this search result, it seems that I am not the only one who feels this

https://answers.yahoo.com/question/i...6224323AAd9GBZ

and I also know what the discussion about subconcussive impacts is about(especially football). But what does in fact count as a subconcussive impact? I did't hit my head, the impact was just on the arm. Because of my extreme head sensitivity, I also feel it in my brain, when I lay on a pillow and hit the pillow with my hand(that occasionally happens during sleep). Can this be called a subconcussive impact?

Typically when I have seen articles on sub-concussive impacts affecting the brain, it has been referring to many of them during a season. Such as heading many soccer balls, or being in many football tackles.

I don't think hitting your hand against the pillow while your head is on the pillow would come even close to the forces required for it to be considered a sub-concussive impact. But that is just my understanding of it.

I suffered and continue to suffer from anxiety, which often resulting in questions like you are asking now. You would be very surprised at the array of symptoms that just anxiety can cause.