What causes fnd flare up

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Last updated: April 4, 2026

Quick Answer: Functional Neurological Disorder (FND) flare-ups, also known as symptom exacerbations, are often triggered by stress, both physical and emotional. Changes in routine, fatigue, illness, or even positive excitement can also lead to a temporary worsening of symptoms.

Key Facts

Overview

Functional Neurological Disorder (FND) is a condition where there are problems with the functioning of the nervous system. It is not a problem with the structure of the brain, but rather how it works. FND can affect movement, sensation, and cognitive functions. A common experience for individuals with FND is the occurrence of 'flare-ups' or symptom exacerbations, where symptoms temporarily worsen. Understanding what causes these flare-ups is crucial for managing the condition and improving quality of life.

What are FND Flare-Ups?

FND flare-ups are periods where the symptoms associated with FND become more intense or pronounced than usual. These can include increased weakness, tremors, dizziness, sensory disturbances, fatigue, or other neurological symptoms. It's important to remember that these flare-ups are typically temporary and do not signify a new or different neurological disease. They are a manifestation of the underlying functional changes in the brain's processing.

Common Triggers for FND Flare-Ups

While the exact mechanisms behind FND are still being researched, several common triggers have been identified by individuals with the condition and clinicians.

1. Stress (Emotional and Psychological)

This is arguably the most significant and frequently reported trigger for FND flare-ups. Stress, in its many forms, can overload the nervous system's ability to regulate itself. This includes:

2. Physical Stressors

The body's physical state plays a significant role in FND symptom management. Physical stress can disrupt the delicate balance of the nervous system and lead to a flare-up:

3. Changes in Routine

Humans, and particularly those with FND, often thrive on predictability. Disruptions to routine can be a form of stress:

4. Sensory Overload

The FND brain may have difficulty filtering sensory information. Exposure to excessive noise, bright lights, strong smells, or crowded environments can overwhelm the system.

5. Weather Changes

Anecdotal evidence suggests that some individuals with FND report symptom changes related to barometric pressure changes or extreme weather conditions, though this is less consistently documented than other triggers.

Managing and Preventing Flare-Ups

While not all flare-ups can be prevented, proactive management can reduce their frequency and severity:

It is essential to work closely with your healthcare team, including neurologists and therapists, to develop a personalized management plan for FND and its flare-ups. They can provide tailored strategies and support to navigate the challenges associated with this condition.

Sources

  1. Functional neurological disorder - NHSfair-use
  2. Functional neurological disorder - Symptoms and causes - Mayo Clinicfair-use
  3. What is FND? - FND Hopefair-use

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