The burning sensation associated with vaginismus is not imagined, and it is not simply anxiety. It is a genuine sensory response one that can be understood through how the nervous system detects, transmits, and processes pain. What follows is a step-by-step explanation of that process.
1. How pain signals begin (nociception)
When pelvic floor muscles tighten involuntarily, they place pressure on nearby nerves. This activates specialised pain receptors called nociceptors sensors designed to detect potential harm from mechanical stress (such as muscle spasm or microtears), chemical changes (inflammation, tissue acidity), or thermal factors (increased blood flow from irritation).
The nervous system interprets this pressure as potential harm and generates pain, even when no tissue damage is occurring. When this pattern repeats, the nervous system can become sensitised learning to associate touch, penetration, or even anticipation with threat, so that pain may arise earlier and with less contact.
2. How pain signals travel
Once nociceptors are activated, they send signals through the peripheral nerves to the spinal cord along two pathways: A-delta fibres, which conduct sharp, sudden, localised pain quickly, and C fibres, which are slower and responsible for burning, aching, or persistent discomfort.
Because vaginismus-related pain is often carried by the slower C fibres, the sensation can feel diffuse rather than pinpointed described as burning, raw, or aching rather than a single clear point. It also settles more slowly, which is why discomfort can linger for minutes or hours after contact has stopped.
3. Processing in the spinal cord (central sensitisation)
Pain signals reaching the spinal cord pass through the dorsal horn a relay station that regulates how strongly those signals are forwarded to the brain. With repeated input over time, this relay system can become overresponsive.
The spinal cord itself becomes sensitised, amplifying pain signals and lowering the threshold at which pain is perceived. Sensations that would normally feel neutral light touch, gentle pressure can begin to register as painful. This is known as allodynia, and it reflects a nervous system that has learned to stay on high alert.
4. Pain perception in the brain
By the time signals reach the brain via the thalamus, they are no longer just information about sensation. The somatosensory cortex determines where the pain is and how intense it feels, while emotional and threat-related centres including the limbic system respond to fear, stress, and memories associated with penetration. When these systems activate together, pain can feel more overwhelming than the physical stimulus alone would suggest.
This does not mean pain is “in your head.” It means the brain is doing exactly what it is designed to do attaching meaning and protection to sensory input. When pain has been repeated or distressing, the brain becomes more alert to potential threat, which amplifies how strongly pain is perceived.
5. Pain response and modulation
Once the brain has registered pain, it continues to shape what happens next. If fear, stress, or vigilance are present, the brain is more likely to amplify pain and muscle guarding rather than releasing calming, pain-reducing chemicals such as endorphins and serotonin.
This does not usually mean the pelvic floor is clenched tightly all day. More often, the muscles sit in a baseline state of readiness slightly braced and quick to tighten particularly during situations that feel vulnerable, intimate, or unpredictable. During sexual activity, medical examinations, or even anticipation, that background tension can escalate into stronger involuntary contraction.
What remains less understood is how these learned patterns become entrenched, and what most effectively helps the nervous system update those threat responses. I look forward to sharing my ongoing research as it develops.
I look forward to sharing my ongoing research,
Fai
