“蛋疼”究竟是一种什么感觉？
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如果大部分喜剧电影是正确的，那么男人的裆部被踢了一脚这种桥段肯定会让你发笑。不过，如果男同志们有过腹股沟被飞踹的经历的话，你也会对此有相同的感受，因为这种痛苦的感觉绝对能让坚强的男人流泪。
这种痛苦的奇怪之处在于：被踢的地方跟痛的地方不一样。如果腹股沟被挨了一脚，并不会让你蛋疼，但是会让你胃疼，甚至到了呕吐的地步，但这是为什么呢？
为了理解这一机制，我们先从开始说起。当男性的腹股沟遭受重击之后，信号会以426km/h的速度（相当于高铁了）传递到大脑中。这一信号会告诉大脑腹股沟地区的战况，之后，会产生一个痛觉信号，告诉机体有部位受到了重创。
这也是我们能够感到痛的一般原理，即机体的一般警示系统。
当这一情况发生时，机体会产生一种天然的止痛药“内啡肽”帮助缓解疼痛，但这一化合物会导致氧含量的下降并进而导致反胃以及头疼症状的出现。
同时，其它过程也在进行。根据不同人的体质差异，内啡肽的释放有可能会导致内耳肿胀，进而导致头昏眼花，总之，身体自然反射会让你变得很虚弱。
尽管腹股沟受伤对人的影响相对更加严重，但这一机制是大同小异的。但是为什么受伤的部位与疼痛发作的部位会有差异呢？是机体的误导吗？
实际上，这是很有道理的。这是因为男性的睾丸是在腹腔中形成的，在他们离开以后，还是会有很多神经与血管组织与腹腔连接。
当受伤引发的信号从睾丸出发后，痛觉会首先经过腹腔然后再次分流，这时候痛觉会停留在腹部。但是，事实上的确是睾丸在疼痛。
总之，踢人的裆的确会造成很大的不适，因为那块区域十分小，而且很敏感，痛觉信号会限制在腹腔出不去，从而感觉上像是腹部疼痛，而且庞大的迷走神经与内啡肽会使得人感到虚弱，引发呕吐感。最后，男同志们轻易不要尝试。
We’re wincing just thinking about it.
If countless comedy movies are correct, there’s something inherently funny about a man getting kicked in the crotch. But if you’ve ever been on the receiving end of a flying groin kick, you'll know that there’s nothing funny about it, because the pain is enough to even make even the toughest of guys buckle over in agony.
There’s something strange about this pain, though: it’s displaced. A kick to the groin doesn’t cause a man’s testicles to hurt - it causes his stomach to churn so badly, he might even have to throw up. But why?
To understand this, let’s start at the beginning. When something smashes into a man’s groin, a signal travels at a whopping 426 km/h (265 mph) to the brain. This signal, sent by a neurotransmitter called Substance P, tells the brain that something just happened in the groin area, and a pain signal needs to be sent out to alert the body that something is horribly wrong.
This is the whole reason why we experience any pain in any form - it’s basically the body's alarm system.
While this is happening, according to Men’s Journal, endorphins - natural painkillers your body produces - kick into gear, which can cause a drop in oxygen levels leading to nausea and headaches.
A few other processes might take place as well. Depending on the person, this rush of severe pain and endorphin release can cause inner ear swelling, which can cause dizziness, and could trigger the cervical sympathetic ganglia, which causes people to tear up. In other words, your body makes you into a huge wuss.
Though it may seem more severe with a groin injury, these processes pretty much happen when any part of the body sustains a painful injury. With that in mind, it seems silly that pain, which is meant to alert you of injury, would express itself in a man’s abdomen instead of testicles, right? Why would your body mislead you like that?
Well, it actually makes a lot of sense, because a man’s testes form in the abdomen. After they descend, nerves and blood vessels are still connected to that area.
When Substance P gets released from a man’s testicles, the pain signals have to travel from the abdomen and down into each testicle. Since these pathways are more present in the abdomen, it feels like the pain stops there. This isn’t necessarily true, though, because a man’s testicles are definitely in pain. It appears that the abdominal pain just distracts us from the pain in the testicles because it’s a larger area.
As Anthony Rivas from Medical Daily explains, the vagus nerve - an extremely long and sensitive nerve that runs all the way from your face to your groin - is largely to blame here.
Since the vagus nerve is so long and sensitive, it’s one of the pathways along which pain is sent when someone is kicked in the crotch. But its size and length also mean that the pain becomes more generalised when it reaches the abdomen, which is why there’s more of a painful feeling there than where the man was hit.
To make matters worse, when the vagus nerve spazzes out, it can also cause nausea, headaches, and a bunch of other symptoms that are no fun for anyone.
In conclusion, a crotch shot is a perfect storm of pain and unpleasantness. Since it’s such a small, sensitive area, pain signals seemingly get trapped in the abdomen. Plus, the vagus nerve and a rise of endorphins can cause a person to feel sick, sweaty, and dizzy, which is enough nonsense to make a logical person consider wearing a cup every time they leave the house.
