Once activated, the trigeminal nerve transmits pain signals.

一旦被激活，三叉神经会传递痛觉信号。

Posture can even influence your emotional state and your sensitivity to pain.

姿势甚至可以影响你精神状态以及你对痛觉敏感度。

During a migraine, this pain pathway becomes sensitized, meaning the threshold for provoking pain is lowered.

当偏头痛发作时，这个痛觉通路会变敏感化，意思是能触发痛觉下降了。

I've always wondered how does my sense of pain compare to other people's sense of pain.

我一直想知道我痛觉和别人痛觉相比如何。

Sense of touch and pain, do something totally different and it wasn't known how they do it.

触觉和痛觉作用是完全不同，我们不知道它们是如何作用。

And because your retinas don't have any pain receptors, your eyes have no way of warning you to stop.

且因为你视网膜没有痛觉感受器，你眼睛无法警告你停下来。

Damage to the spinothalamic tract causes a loss of temperature and pain sensation.

损伤脊髓丘脑束可以导致痛觉和温度觉丧失。

The brain doesn't have pain receptors, so you can't feel the blockage itself.

大脑没有痛觉感受器，因此你无法感受到堵塞本身。

So an oyster may recoil when squirted with lemon juice, for instance, because of nociception.

因此，比如牡蛎在被喷上柠檬汁时可能会退缩，这便是痛觉传导作用。

And we have a higher pain tolerance.

且我们有更高痛觉。

So we get hypersensitivity of our nociceptors, which is our pain receptors.

于是，我们伤害感受器——即痛觉感受器——变过度敏感。

And as you're describing, the nervous system creates our sense of pain.

正如你所描述，神经系统产生了我们痛觉。

So they're not stubbing their toe or slamming into the pain sensitizer.

因此，他们并未踢到脚趾或猛烈触发痛觉敏感器。

And when you spend with real cash, it activates the pain centers of the brain.

当你使用真实现金消费时，会激活大脑痛觉中枢。

How many pain receptors does the brain have?

大脑有多少痛觉感受器？

In a normal functioning human, motor response to pain is natural reflex.

对于正常人言，对痛觉产生运动反射是一种自然反应。

Certain chemicals can tune nociceptors, lowering their threshold for pain.

某些化学物质可以调节感受器，降低痛觉。

When you eat something spicy, the pain receptors in your mouth initiate your body’s heat response.

当你吃辣东西时，你嘴里痛觉感受器会启动你身体热反应。

They just stay off the desensitizer now.

他们现在只是避免接触痛觉脱敏剂。

By then, researchers had already discovered that immune cells called macrophages probably contribute to endometriosis and that pain-sensing nerves are also involved.

那时，研究人员已经发现， 被称为巨噬细胞免疫细胞可能与子宫内膜异位症有关， 痛觉神经也参与其中。