Causes and triggers of the vagus nerve.


The vague response occurs when the vagus nerve is stimulated. The vagus nerve is the longest nerve in the body. It goes from the brainstem to the chest and abdomen.

When this nerve is stimulated, a chain of events is triggered in the body. These changes can cause a wide variety of discomforts and symptoms.

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The vague response gets its name from the interaction of the vagus nerve and blood vessels. The missed reaction has many names, including:

This article explains the vagus nerve response, its triggers, symptoms, causes, and how to treat it.

Triggers of the vagal response

There are many triggers that can trigger a vagal response. Some of these triggers are internal, while others come from the environment. Common triggers include:

  • Emotional stress
  • Blood sample or blood type
  • Fear
  • Gastrointestinal diseases
  • Defecation
  • Hot
  • Pain
  • Standing for a long time
  • Get up fast
  • Injury

Vagus nerve symptoms

Once the erratic response has occurred, you may experience various physical symptoms. This includes:

  • Blurred or tunnel vision
  • Clammy skin
  • Dizziness
  • Fainting
  • i feel warm
  • Dizziness
  • Nausea
  • Tinnitus
  • Perspiration
  • Turns pale


An errant reaction affects your central nervous system (brain and spinal cord), peripheral nervous system (nerves), and cardiovascular system (heart and blood vessels). When the reflex is activated, it causes a sudden drop in blood pressure and heart rate.

When this happens, the blood vessels in the legs can dilate. This can cause blood to pool in the legs, which can lead to an even greater drop in blood pressure.

All of these changes can lead to decreased blood flow to the brain. This can make you feel like you've passed out.

The strength of the vagal response and the resulting symptoms vary from person to person. Some people can easily pass out when they see blood or are afraid, while others may never react.

Vasovagal syncope

It is impossible to discuss the vagal response without discussing vasovagal syncope . When fainting , a person loses consciousness due to a drop in blood pressure and blood flow to the brain.

Vasovagal syncope is the loss of consciousness caused by a vagal reaction.

Vasovagal syncope can cause a person to faint and fall to the ground. Loss of consciousness usually only lasts a couple of minutes. Then when the blood flow returns to the brain, the person will wake up and return to normal consciousness.

What to do during a vasovagal episode.

A vasovagal episode can be scary. But this is usually not a sign of a medical emergency. Some things that can help include:

  • Lie down for about 10 minutes.
  • Lower your head between your knees.
  • Drink some water.
  • Don't get up quickly (this can cause you to pass out).

During bowel movements

Some people, especially those with irritable bowel syndrome (IBS), have vasovagal symptoms when they defecate. To prevent this from happening, try to relax.

Sit on the toilet with your head down and your legs crossed. This can help keep your blood pressure stable.


Vagus nerve attacks cannot always be prevented. But some things can help to reflect them. This includes:

  • Sweet Dreams
  • Stay well hydrated
  • Avoid standing for long periods of time

Although a person in good health may experience a vagal response, they should inform their doctor if this happens to them. Based on your symptoms and medical history, your healthcare provider will be able to determine if any tests are required.


A vague response is a series of unpleasant symptoms that occur when the vagus nerve is stimulated. Often times, this reaction is triggered by certain things, such as stress, pain, and fear.

Symptoms of vagus nerve include dizziness, nausea, ringing in the ears, and sweating. In some cases, this can lead to loss of consciousness. This is called vasovagal syncope.

If you are experiencing a vagal response, take an oath for a few minutes or sit with your head between your knees and don't get up quickly. Always tell your doctor about these symptoms so they can look for other conditions.

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