vagus nerve

Often, when a person thinks of pain, tension, or physical discomfort, they tend to focus solely on muscles or  joints. However, the body functions as a deeply connected network where the nervous system,  internal organs, and biomechanics also influence how we feel. 

Within this connection, the vagus nerve plays an essential role. It is one of the most important structures of the autonomic  nervous system and is involved in functions that go far beyond digestion, influencing emotional regulation,  stress response, inflammation, heart rate, and overall bodily balance.

What is the vagus nerve? 

The vagus nerve is the main component of the parasympathetic nervous system, responsible for promoting states of  recovery, rest, and regulation. 

Its function is to help the body transition out of constant alert mode and enter a more efficient state of repair and  balance. 

Key functions of the vagus nerve 

The vagus nerve is involved in multiple processes, including: 

• Regulation of heart rate 

• Control of digestive processes 

• Intestinal motility 

• Gut-brain communication 

• Modulation of stress and anxiety 

• Influence on respiration and the diaphragm 

• Inflammatory regulation 

• Involvement in rest and recovery 

In simple terms, it can be understood as a key communication pathway between the brain, viscera, and physiological state.

 What happens when the vagus nerve is not functioning efficiently?

When a person lives under prolonged stress, constant emotional tension, respiratory alterations, surgeries,  inflammatory processes, or restrictive physical patterns, the nervous system can remain in a more sympathetic  (alert or survival) state. 

This can promote symptoms such as: 

• Slow or heavy digestion 

• Abdominal bloating 

• Feelings of anxiety or hypervigilance

• Depression 

• Diaphragmatic tension 

• Persistent fatigue 

• Sleep disturbances  

• A feeling of bodily disconnection 

• Increased sensitivity to pain

Important note: 

Often, the body does not simply need to "relax", but rather to regain its capacity for neurological regulation. 

How to know if your nervous system is in a state of overload? 

The vagus nerve is part of the autonomic nervous system and participates in essential functions such as breathing,  digestion, rest, cardiac regulation, and the body's ability to relax and recover. 

When the body remains under physical, emotional, or inflammatory stress for a long time, the nervous system  can stay in a constant state of alert. This can generate symptoms that often seem disconnected  from one another, but actually share the same underlying basis of dysregulation.

Common signs that may be related to an alteration in vagal regulation 

Changes related to stress and nervous system regulation 

• Constant feeling of anxiety or nervousness 

• Difficulty relaxing even in calm moments 

• Feeling of permanent alert

• Mental fatigue or "brain fog" 

• Trouble sleeping or resting deeply 

Respiratory and sleep alterations 

• Shallow or shortness of breath 

• Frequent waking during the night 

• Feeling unrefreshed upon waking 

• Snoring or feeling a lack of air during sleep 

• Somnolence or persistent fatigue during the day 

Digestive and visceral symptoms 

The vagus nerve has a direct relationship with digestive functioning and intestinal movement. When dysregulation occurs,  the following may appear: 

• Abdominal bloating 

• Slow digestion 

• Acid reflux 

• Sensation of heaviness 

• Nausea with no clear medical cause 

• Functional abdominal pain 

Muscular tension and persistent pain 

Often, the body expresses the overload of the nervous system through the musculature. 

This can manifest as: 

• Constant tension in the neck and shoulders 

• Bruxism or teeth clenching 

• Jaw pain upon waking 

• Persistent muscle stiffness 

• Body aches without apparent injury

An important point: 

The body can become so accustomed to living in tension for so long that the person stops perceiving it as  abnormal. 

The connection between the vagus nerve, jaw, and neck

There is a very close relationship between breathing, the nervous system, the jaw, and cervical musculature. 

When the body remains in a state of sustained stress: 

• breathing often becomes altered, 

• neck tension increases, 

• the diaphragm loses mobility, 

• and the jaw may remain unconsciously hyperactive. 

That is why symptoms like bruxism, neck tension, and fatigue can be more connected than they seem. 

What does a vagus nerve questionnaire aim to assess? 

This type of evaluation does not seek to diagnose diseases, but rather to identify signs of potential dysregulation of the autonomic  nervous system and vagal tone. 

It can help to understand: 

• how the body responds to stress, 

• how certain symptoms relate to each other, 

• and why some physical tensions persist over time.

A more comprehensive approach to treatment 

From an integrative physiotherapy perspective based on biomechanics, neuroscience, and nervous system regulation, the goal is  not just to treat a painful area, but to understand how these factors relate: 

• Breathing 

• Muscle tension

• Viscera 

• Sleep 

• Posture 

• Movement and the nervous system. 

Through physiotherapy techniques such as: 

• Manual therapy 

• Myofascial release

• Visceral therapy 

• Diaphragmatic work 

• Breathing re-education 

• Deep muscle activation 

• Tapping techniques  

• Hypopressive exercises  

• Therapeutic exercise can form part of a more complete treatment tailored to each patient. 

Sometimes the body does not simply need to "rest more," but rather to recover its capacity for regulation. Understanding how the nervous system influences pain, muscle tension, sleep, or digestion allows us to address  many symptoms from a deeper and more interconnected perspective.