# Nervous System Sensitivity ##### Untangling Pain ---  --- ## tl;dr - I look at nerve density, hormones, stress responses, central sensitisation, and pain processing to understand women’s pain. - More sensory input and hormonal changes may affect how easily the danger alarm system is triggered. - Stress responses can be different and longer-lasting; that is physiological, not simply “being stressed”. - With central sensitisation, even touch or small changes can feel painful without a matching injury. - The AI images in the video are visual aids, not realistic pictures of what nerves look like. > [!abstract]- Transcript > > This second area we're going to look at is nervous system sensitivity and why, as females, this makes us more susceptible to pain. > > So there are five ways in which the female nervous system is different from the male nervous system. > > Number one, higher nerve density. Number two, hormonal influences on the nervous system. Number three, heightened stress response. Number four, Central Sensitisation. And number five, differences in pain processing. > > And, for the record, if you're watching this recording, many of the images are AI generated, so please don't think they are realistic. They are not. I just have this massive struggle when it comes to images and I overthink things, so I've used AI just to make things look a little bit prettier if you're watching this, but they're not exact. > > Firstly , number one, higher nerve density. Now, women tend to have a greater density of nerve fibres in certain areas of their bodies, like the skin, making them more sensitive to stimuli. Which could then mean that the fire alarms are set off more, and more easily as there is more input. And more input means, the chance of firearms being set off. Which potentially lead to more pain. > > This means that the same painful stimulus might feel more intense for women than for men due to the higher nerve density. > > Number two, hormonal influences. We've already looked at hormones and how they affect pain and I know I'm probably stating the obvious but I wanted to note that hormones they affect pain and it's because they're affecting the nervous system. > > And again, this is another reason why, women's nervous system is different from men's. It's because the hormones that we have and their influence on the nervous system. > > Number three, the stress response. So women have a heightened stress response compared to men. And a paper I came across explained that the locus coagulus, or the LC, is one of the stress centers in the brain. And in response to a blood pressure stress test, female LC neurons fire faster than those of males. > > So basically the message that there is danger gets sent to the brain a lot quicker in females. This paper also explained how female rats also have more receptors for stress related neurotransmitters than male rats. So basically, they have more fire alarms to begin with. And female neurons don't clear the neurotransmitters as quickly from the synapses as males do. > > What this means is that a stress reaction lasts longer in females than in males. So the fire alarms, they stay on longer. And as we have seen previously, stress influences pain. And because women have a heightened stress response, then this could be an additional reason for us to experience the pain the way that we do. > > I just want to point out that I'm talking about the stress response. This is a physiological response by the body. I'm not talking about women are also stressed all the time. It is a physiological response that the body makes. And we are created differently to men for this reason. > > So number four, Central Sensitisation. > > Central Sensitisation is where the pain output from the brain is disproportionate to the physical threat that is happening. And it's been found that women are more likely to experience Central Sensitisation. Where the nervous system becomes hypersensitive. > > And this is thought that this is what is happening behind the conditions like fibromyalgia, like endometriosis, like chronic fatigue. Essentially the brain is amplifying the pain response. And it makes even non painful stimuli, feel painful. Again, it's the idea that pain isn't just coming from some physical reason. > > When we, we break a bone or go over on our ankle, there is a physical change. There is a physical injury. > > Whereas Central Sensitisation is telling us it's to do with the brain, the spinal cord and the nervous system. So it's back to the idea that pain is produced by the brain and when it comes to these conditions, more pain does not equal more damage. > > In fact, quite often, there actually isn't any damage at all, it's simply that the brain produces pain because it thinks it needs to. Because it thinks it needs to be protective, it needs to become oversensitive. > > And when it does this, it means that even touch can become painful. And again, this tends to be the case much more so in women. > > Number five, differences in pain processing. > > So it's been found that differences in pain processing come more from variations in the brain as opposed to spinal activity. So basically pain is processed differently for women. Now, one of the studies I actually came across explained one of the reasons for this was actually to do with anxiety. And that women show a greater overall anxiety sensitivity than men. > > This then has an impact on our pain response. > > I've looked at anxiety previously, how anxiety affects the nervous system and how this affects pain. So again, for women, this difference in pain processing can be another reason why we are more susceptible to pain. Next lesson → [[Untangling Pain – Module 3 Lesson 06 – Inflammation & Immune Response|Inflammation & Immune Response]] %% ## Extra ## Version 1: Full Nervous System Sensitivity and Why This Makes Us More Susceptible to Pain There are five ways in which the female nervous system is different from the male nervous system Number one, higher nerve density Number two, hormonal influences on the nervous system Number three, heightened stress response Number four, Central Sensitisation Number five, differences in pain processing For the record, if you’re watching this recording, many of the images are AI generated, so please don’t think they are realistic They are not I just have this massive struggle when it comes to images and I overthink things, so I’ve used AI just to make things look a little bit prettier if you’re watching this, but they’re not exact Higher Nerve Density Women tend to have a greater density of nerve fibres in certain areas of their bodies, like the skin, making them more sensitive to stimuli Which could then mean that the fire alarms are set off more, and more easily as there is more input And more input means the chance of fire alarms being set off Which potentially leads to more pain This means that the same painful stimulus might feel more intense for women than for men due to the higher nerve density Hormonal Influences We’ve already looked at hormones and how they affect pain I know I’m probably stating the obvious but I wanted to note that hormones affect pain and it’s because they’re affecting the nervous system And again, this is another reason why women’s nervous system is different from men’s It’s because of the hormones that we have and their influence on the nervous system Heightened Stress Response Women have a heightened stress response compared to men A paper I came across explained that the locus coeruleus, or the LC, is one of the stress centers in the brain In response to a blood pressure stress test, female LC neurons fire faster than those of males Basically, the message that there is danger gets sent to the brain a lot quicker in females This paper also explained how female rats also have more receptors for stress-related neurotransmitters than male rats Basically, they have more fire alarms to begin with Female neurons don’t clear the neurotransmitters as quickly from the synapses as males do What this means is that a stress reaction lasts longer in females than in males So the fire alarms, they stay on longer As we have seen previously, stress influences pain Because women have a heightened stress response, this could be an additional reason for us to experience the pain the way that we do I just want to point out that I’m talking about the stress response This is a physiological response by the body I’m not talking about women are also stressed all the time It is a physiological response that the body makes And we are created differently to men for this reason Central Sensitisation Central Sensitisation is where the pain output from the brain is disproportionate to the physical threat that is happening It’s been found that women are more likely to experience Central Sensitisation Where the nervous system becomes hypersensitive This is thought to be what is happening behind the conditions like fibromyalgia, like endometriosis, like chronic fatigue Essentially the brain is amplifying the pain response It makes even non-painful stimuli feel painful Again, it’s the idea that pain isn’t just coming from some physical reason When we break a bone or go over on our ankle, there is a physical change, there is a physical injury Whereas Central Sensitisation is telling us it’s to do with the brain, the spinal cord and the nervous system It’s back to the idea that pain is produced by the brain and when it comes to these conditions, more pain does not equal more damage In fact, quite often, there actually isn’t any damage at all It’s simply that the brain produces pain because it thinks it needs to Because it thinks it needs to be protective, it needs to become oversensitive When it does this, it means that even touch can become painful This tends to be the case much more so in women Differences in Pain Processing Differences in pain processing come more from variations in the brain as opposed to spinal activity Basically pain is processed differently for women One of the studies I actually came across explained one of the reasons for this was actually to do with anxiety Women show a greater overall anxiety sensitivity than men This then has an impact on our pain response I’ve looked at anxiety previously, how anxiety affects the nervous system and how this affects pain So again, for women, this difference in pain processing can be another reason why we are more susceptible to pain Resources or Mentioned Locus coeruleus (LC) Central Sensitisation Conditions: fibromyalgia, endometriosis, chronic fatigue Studies on female stress response and anxiety sensitivity AI-generated images (mentioned for visual reference) %%