
Okay, that just happens in manga, so don't take it seriously. I've never seen that happen in my life, though I'm Japanese.

But that does make one wonder how the tropes got started in the first place. Fainting I get, but nosebleeds caused by arousal? How the heck did that one become common if it doesn't happen anywhere? Besides, I have to admit I hate that one, as every time I read a "nosebleed" case my thoughts are not only "not effing likely" but "ugh gross", and normally distracting to subject at hand. I did however always assume it was fictional exaggeration to say the least.

It has nothing to do with reality its just to show excitment and sometime arousal in a character .i personally found this very entertaining (๑•ㅂ•)و✧.its quite funny to see characters getting nosebleed beacuse of excitement or arousal i like it.

I agree--and I wonder about it too.
Maybe the nose bleed is a more polite physical manifestation of sexual arousal than real life evidence? I wonder if the fact that it would probably be rude to draw a hard on in some places (or to mention it) or the fact that it would not be very "pure" for a good woman to get all wet made some people talk about nose bleeds instead? Or maybe it's just the the blood is rushing somewhere? Anyway, it's a sort of story element short cut, and not literal.
Feinting used to be popular in the west when women wore corsets, and it was somehow delicate and pure. You used to see it in movies too. Maybe that also affected manga?

Interesting theory about nosebleeds, and very possible. As to fainting, not sure about the corset correlation, as by these days corsets and everything associated with them is seen as being rather naughty and sexy. However, fainting from fever or pleasure does happen if infrequently, so I'm more inclined to just take it as a literary and fictional exaggeration which is becoming trite from overuse. The function is simply to emphasize how sick (or pleasured) etc. the character is, i.e. to the point of fainting.

Yes, people can really faint--though I have never seen someone faint from pleasure. I suppose it is possible....maybe. I remain skeptical.
I do know about the corsets though. Back in the Victorian era, when corsets were proper instead of naughty, nice houses had fainting rooms with fainting couches for the ladies. Their corsets were so tight they could not breathe properly. They were also supposed to eat "like birds" (possibly for a smaller corset). So you have a woman with low blood sugar who cant take a full breath and add anything--heat, stress, the sight of a hot guy. Swoon, I need a feinting couch. :) Although this article also suggests that they were used to give women pelvic messages, making corsets kinky once again: http://www.victorian-era.org/fainting-couch-victorian-era.html
At least I fairly sure the Japanese are not using feinting as a symbol for the need of pelvic message--or are they?

I'm not disagreeing with you that corsets made Victorian women swoon. My point was that modern associations with corsets are the opposite of pure=naughty. Nor do we modern people immediately correlate fainting with corsets, but if anything physical weakness of some sort. However, thinking about it, the Japanese do seem to consider it "feminine" to be physically delicate, and that would include fainting easily. So the uke faints...
Are japanese really that week that always faint?i never faint like these mangas
Am i too strong or too lazy that always have energy?!!!