Symptoms · Symptom Library · FND presentation

Functional tremor

Shaking you cannot switch off

Also called: functional tremor · functional shaking

Functional tremor is rhythmical shaking of a body part that is involuntary. It may vary in speed and severity, come and go, and become more obvious when attention or stress load rises.

Safety. Seek urgent help for sudden tremor with stroke-like signs, severe headache, new one-sided weakness, chest pain, or a pattern that is clearly not your usual FND.

How it can feel

  • Shaking in a hand, arm, leg or head that will not settle on command.
  • Tremor that changes speed or jumps between body parts.
  • Quiet moments then sudden violent shaking.
  • Worse when you try hard to hold still or when people are watching.

Day to day

  • Writing, eating, using phones and tools can become messy or tiring.
  • Social self-consciousness is common and exhausting in its own right.
  • Some people avoid cafés or public transport for fear of visible shaking.

Why this can be FND (simply)

Functional tremor is a movement programme problem in the nervous system. It is not the same as choosing to shake. It can start after injury, pain, illness or high load — or with no neat story.

What can help

  • Accurate diagnosis and a clear explanation.
  • Specialist physiotherapy approaches for functional movement symptoms.
  • Reducing “fight the tremor” tension that can amplify it for some people.
  • Task adaptation, rest breaks and supportive seating or grips.
  • Addressing sleep, pain and overload that raise the volume.

This is information, not a treatment plan. Personal care decisions belong with you and your clinicians.

FAQs

Why does my tremor stop sometimes when I am distracted?

Attention and nervous-system state can change functional movement. That variability is a recognised pattern — not proof you invent the tremor.

Is functional tremor the same as Parkinson’s?

No. Different mechanisms and assessments. Only a clinician can diagnose.

Next steps