Common Symptoms of FND

• weakness in the legs, arms, or one side of the body 
• difficulty walking or sudden loss of balance 
• tremors that change speed or pattern 
• jerking movements or involuntary shaking 
• functional dystonia, including abnormal postures 
• muscle freezing, heaviness, or sudden collapses 

• non-epileptic episodes that can resemble seizures 
• shaking, stiffening, or loss of responsiveness 
• eyes closed or fluttering during some functional seizures 
• episodes that may sometimes occur alongside stress, pain, fatigue, or sensory overload, although a clear trigger is not always present
• confusion or exhaustion afterward 

• numbness or tingling 
• patchy or inconsistent sensory changes 
• changes in vision such as blurring, double vision, or blackouts 
• hearing sensitivity or reduced hearing 
• oversensitivity to light, sound, or touch 

• slurred or slowed speech 
• loss of voice, sometimes called functional aphonia 
• difficulty forming words 
• stuttering or speech blocking 
• whispered speech or inconsistent voice volume 

• brain fog 
• difficulty concentrating 
• memory problems 
• slowed processing 
• trouble organizing thoughts 
• mental fatigue 

These experiences can occur alongside FND, but they may have other causes and are not necessarily caused by FND itself.

• fatigue or sudden exhaustion 
• chronic pain or widespread discomfort 
• nausea or dizziness 
• rapid heart rate, especially during stress 
• temperature sensitivity 

• overwhelm or shutdown during stress 
• increased symptoms with emotional load 
• sudden crying or emotional swings 
• freeze responses or dissociation 

FND symptoms often:

• come and go 
• worsen with stress or sensory overload 
• shift from day to day 
• vary in intensity 

This fluctuation is common in FND and does not mean someone is faking or exaggerating symptoms.