Essential tremor vs. Parkinson's: why most shaking isn't Parkinson's

A hand starts to shake. A spoon rattles against the bowl, a signature wanders off the line, and a cup needs two hands instead of one. Most people's minds go straight to one question: is this Parkinson's?

Usually, it isn't. Essential tremor is far more common. Researchers estimate that about 7 million Americans have it, while the Parkinson's Foundation puts the number living with Parkinson's disease at about 1.1 million. When families ask about essential tremor vs. Parkinson's, the two get confused because both can make a hand tremble. But they're different conditions, they behave differently, and a few simple observations help tell them apart.

A symptom and a disease

Tremor is a symptom: rhythmic, involuntary shaking with many possible causes. Parkinson's is a specific disease. Tremor is one of its best-known signs, but not everyone with Parkinson's has a tremor, and most people with a tremor don't have Parkinson's.

The difference matters for more than reassurance. The two conditions are treated with different medicines and have different outlooks, so mistaking one for the other sends a person down the wrong path.

The one question that separates them

If you remember one thing, make it this: notice when the shaking happens.

Essential tremor is an action tremor. It shows up when the hand is doing something: gripping a coffee cup, signing a check, lifting a fork, holding the arms out. With the hands folded in the lap, it tends to go quiet.

Parkinson's tremor is the reverse, a rest tremor. It's most obvious when the hand sits still, and it often eases once the hand reaches for something. The National Institute of Neurological Disorders and Stroke describes the classic Parkinson's tremor as a "pill-rolling" motion of the thumb and fingers that usually starts on one side of the body. Essential tremor usually affects both hands.

Side by side

No two people are identical, and only a clinician can make the call, but the typical patterns differ in useful ways:

What to notice	Essential tremor	Parkinson's disease
When it shakes	During use: holding, writing, reaching	At rest, hand still in the lap; eases with use
How it looks	Faster, finer back-and-forth shake	Slower pill-rolling of thumb and fingers
Which side	Usually both hands, one often worse	Usually starts on one side
Head and voice	Often involved: nodding, shaky voice	Head tremor uncommon
Other symptoms	Usually tremor alone	Stiffness, slowness, shuffling walk, balance changes
Handwriting	Large and shaky	Small and cramped
Family history	Often runs in families	Only a minority of cases are inherited
A small drink	Often calms it briefly	Little or no effect
Usual age at start	Any age; most often after 40	Usually after 60

Clues you can spot at the kitchen table

• Handwriting. Essential tremor makes writing large and shaky. Parkinson's often makes it smaller and more cramped as the line goes on. Doctors call that micrographia.
• The cup and the spoon. Shaking that spills a full cup or ruins the trip from plate to mouth, while the hands are calm in the lap, points to essential tremor. A hand that trembles on the armrest and steadies as it reaches for the cup leans toward Parkinson's.
• What else is going on. Essential tremor is usually shaking and nothing more. Parkinson's comes with company: stiffness in an arm or leg, general slowing, a softer voice, less arm swing on one side, a shuffling step, a lost sense of smell.
• The head and the voice. A yes-yes or no-no nodding of the head, or a quaver in the voice, is much more typical of essential tremor.

As Johns Hopkins Medicine notes, essential tremor often improves for a short while after a small amount of alcohol. It's a diagnostic clue, not a treatment.

Does a tremor mean Parkinson's is coming?

For most people, no. Essential tremor and Parkinson's are separate conditions, and most people with essential tremor never develop Parkinson's. Essential tremor was once called "benign essential tremor" because it doesn't shorten life.

"Benign" undersells it for some people, though. Essential tremor can end careers in fine handwork, make a restaurant meal embarrassing, and turn buttons and shoelaces into a daily defeat, and it tends to worsen slowly over the years. It deserves to be treated even though it isn't Parkinson's.

And sometimes a shaking hand is neither. An overactive thyroid, low blood sugar, too much caffeine, anxiety, alcohol withdrawal and a long list of medicines (including some asthma inhalers, antidepressants and seizure drugs) can all cause a tremor that goes away once the cause is treated. That's one more reason to start with a doctor's visit, not a search engine.

When to see a neurologist

A tremor deserves a doctor's visit when it:

• makes writing, eating or dressing harder;
• appears at rest;
• comes with stiffness, slowness, or trouble with balance or walking;
• starts suddenly or gets worse quickly;
• began soon after a new medicine.

A primary care doctor can check for the reversible causes and refer to a neurologist or movement disorder specialist. There's no blood test for either condition. Diagnosis rests on a careful exam that watches the tremor at rest and in action and checks for the other signs of Parkinson's. In unclear cases, a brain scan called a DaTscan can help, because it shows the brain's dopamine system, which is affected in Parkinson's but normal in essential tremor.

Getting the name right matters because each condition has its own treatment and its own course. If the diagnosis is Parkinson's, our guide to the stages of Parkinson's disease explains what comes next.

Everyday life with a tremor

Whatever the name, the daily challenge is similar: everything that needs steady hands gets harder. Writing, typing, eating, shaving, buttoning, carrying a full plate to the table.

A lot can be made easier:

• Weighted utensils and wide-grip pens dampen the shake.
• Spill-resistant cups and plate guards take the stress out of meals.
• Bracing one hand with the other, or resting the elbows on the table, steadies fine work.
• Fiddly tasks go better earlier in the day, before fatigue sets in.
• Less caffeine and better sleep help, since both stimulants and tiredness make tremor worse.
• Clothing with magnetic closures or pull-on styles; see our guide to adaptive clothing.

When a tremor makes the small mechanics of the day hard, a steady pair of hands nearby protects both dignity and independence. Our caregivers help with the tasks a tremor complicates, such as dressing, grooming and meals, without taking over. For someone with Parkinson's, our Parkinson's care adds help with balance, walking and the medication schedule. For someone with essential tremor who simply wants company and a hand at meals, a few companion care visits a week may be enough.

A trembling hand is far more often essential tremor than Parkinson's, and either way it's rarely the emergency it feels like in the moment. It still deserves a name from a doctor. If your parent needs help at home while you sort it out, call us or request care.

This article is general information, not medical advice. Any new, worsening or bothersome tremor, especially with stiffness, slowness or balance trouble, should be checked by a doctor or neurologist.