What can mimic Parkinson’s disease? [30+ Parkinson’s Misdiagnoses]

All doctors and possibly all patients should know what can mimic Parkinson’s disease. There are more than 30+ diseases that produce similar similar symptoms.

These mimics may cause Parkinson’s misdiagnosis. For example, hypothyroidism also produces slowness of movements. Therefore hypothyroidism can be misdiagnosed as Parkinson’s disease.

The treatment is different for each of these conditions. Misdiagnosis may lead to ineffective treatment.

A DAT scan (or F-DOPA PET scan) of the brain can confirm the diagnosis.

What can mimic Parkinson’s Disease?

Before we proceed, let’s take a minute to understand some basic stuff.

Here is a collection of 4 extremely important movement problems.

4 movement problems = “Parkinson-ism”
1. Slowness (Bradykinesia, Hypokinesia or Akinesia)

2. Uncontrolled shaking (tremor)

3. Stiffness (rigidity)

4. Unsteadiness & shuffling gait.

This group of problems is collectively called “Parkinsonism”. Parkinsonism means “like those produced by Parkinson’s disease”.

Many diseases produce Parkinsonism. Of course, the most common one is Parkinson’s disease itself!

But, other diseases can mimic Parkinson’s disease by producing similar symptoms. These are called the “Parkinson’s Mimics”.

Let us talk about these Parkinson’s Mimics under 4 headings.

Mimics of Parkinson’s Disease
1.  Drug-induced Parkinsonism

2. Parkinson’s Plus Syndromes

3. Mimics caused by brain destruction

4. Completely unrelated Mimics

The most important Parkinson’s Mimic: Drug-Induced Parkinsonism

Certain medications can reduce the activity of Dopamine inside the brain.

These medications produce symptoms very similar to Parkinson’s disease. Tremor is usually not seen, but some people can even have tremor!

So, drug-induced movement problems can be tough to distinguish from Parkinson’s Disease.

This is the most important cause underlying Parkinson’s Misdiagnosis, by far.

The most important thing is carefully telling the doctor which medications you took recently.

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Unfortunately, some medications can cause Parkinsonism (Symptoms like Parkinson’s disease).

If you are on any of these medications, your symptoms may be a side-effect of these medications.

Type of medicationExamples
1. Many medications used for psychiatric problems such as schizophreniaHaloperidol, Risperdal, Olanzapine, Aripiprazole, Trifluoperazine, Amisulpuride and many more.

Clozapine and low dose Quetiapine usually do not cause problems.

2. Some medications for mood and depressionFluphenazine, Tranycypormine, Lithium
3. Some anti-nausea / anti-vertigo medicationsMetoclopramide, Levosulpuride, High doses of domperidone about 30-40 mg/day, Flunarazine, rarely cinnarizine
4. Some heart and blood pressure medicationsAmiodarone, methly-dopa

Parkinson’s Plus Syndromes

You could think of these as the “evil sisters” of Parkinson’s disease.

These diseases can mimic Parkinson’s disease very closely. Misdiagnosis is very common in the early stages of these diseases.

They have the exact symptoms of Parkinson’s disease. But they also produce additional symptoms such as falling backwards. So, they are called “Parkinson’s Plus syndromes”.

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“Parkinson’s Plus Syndromes” are the evil sisters of Parkinson’s disease.

For example, in one such condition called PSP, the person has trouble moving his eyes. He/She can look from side-to-side but has difficulty looking up or down.

Here is a video of a patient with PSP. This video has been posted on youtube by Dr Dusan Pavlovic.

This patient has trouble looking upwards. He can look downwards, but there is a slight difficulty in doing that as well.

When present, difficulty in looking downwards is highly suggestive of PSP.

Parkinson’s plus syndromes are the diseases that mimic Parkinson’s disease most closely. Misdiagnosis is very, very common.

Parkinson’s Plus syndromes are often mistaken for Parkinson’s disease in the early stages. As they progress and additional symptoms build-up, they are correctly diagnosed.

A table of such diseases is given below. You can read more in this article: What are the Parkinson’s Plus Syndromes?

Parkinson’s Plus SyndromeAdditional Features
1. Dementia with Lewy Bodies (DLB)DLB is the most similar to Parkinson’s disease.

But patients with DLB also have:

  • Visual hallucinations
  • Fluctuating confusion
  • Dream enactment

[Click here for the NIH webpage]

2. Multiple Systems Atrophy (MSA)There is dysfunction of the “Autonomic Nervous System”.

This part helps our brain to manage automatic actions like passing urine and sweating.

So, MSA patients can have:

  • Drop in blood pressure on standing
  • Heart rate abnormalities
  • Loss of urinary control
  • Impotence
  • Sweating problems

etc…

3. Progressive Supranuclear Palsy (PSP)PSP patients have:

  • Trouble moving eyes, especially looking upwards & downwards.
  • Frequent falls, mostly backward
4. Corticobasal Degeneration (CBD)CBD is a rare disease.

  • The person forgets how to use a hand.
  • That arm/hand may have jerks.
  • It may twist into unnatural postures.
5. Many kinds of DementiaDementia is a term for “losing memory”.

Many causes of Dementia also produce Parkinson’s symptoms.

These include:

  • Alzheimer’s disease
  • Fronto-temporal dementia
  • Dementia with Lewy bodies (DLB)
Luckily, decreased Dopamine activity is the main problem in all these diseases. So, the treatment of these Parkinson’s Plus Syndromes is similar to Parkinson’s disease.

Mimics caused by brain destruction

Most of these diseases are due to damage caused by various chemicals.

This process also destroys brain cells which produce Dopamine. This can create a condition very similar to Parkinson’s disease.
Name of the diseaseCaused by
1. Wilson’s diseaseExcessive copper in the brain
2. Neuronal Brain Iron Accumulation (NBIA)Excessive iron in the brain
4. Fahr’s diseaseExcessive calcium in the brain
5. ToxinsExamples:

  • Carbon monoxide poisoning
  • Methanol poisoning
  • Exposure to industrial chemicals such as solvents, petroleum waste & insecticides
5. Lack of oxygen or blood supply
  • Multiple strokes
  • Brain damage due to drowning or a cardiac arrest
6. Infections
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Be safe! Sexually transmitted diseases such as HIV and syphilis can cause Parkinson’s – like symptoms. Of course, these diseases that mimic Parkinson’s disease are treatable.

Completely Unrelated Mimics

These conditions have almost nothing in common with Parkinson’s disease, except that they look similar. Most importantly, their causes and treatments are very different.

It is like saying that the Moon and the Sun are similar because both are round.

These diseases that mimic Parkinson’s are usually easy to spot. Unfortunately, misdiagnosis is still possible.

1) Conditions that can cause tremors besides Parkinson’s:

The tremor of Parkinson’s disease occurs even at rest. Hence it is called a rest tremor. Very few other conditions produce rest tremor.

But, many other diseases produce a tremor which is seen only when moving, for example when writing. This is called an Action tremor or posturokinetic tremor. Even these diseases are sometimes misdiagnosed as Parkinson’s disease.

Causes of Rest TremorCauses of Action Tremor
1. Parkinson’s disease

2. All other causes described so far

3. A condition called Dystonia

4. Strokes in some regions of the brain (such as the thalamus and red nucleus)

1. Essential Tremor

2. Excessive stress, coffee or smoking

3. Medications such as bronchodilators, valproate and lamotrigine

4. Chromosomal problems such as Fragile-X syndrome

5. Parkinson’s disease itself!

And many others…

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If your hands shake ONLY and ONLY when you are doing something, you may not have Parkinson’s disease. This is called an Action Tremor. You may have a Parkinson’s mimic – most likely essential tremor or Dystonic tremor.

2) Conditions that mimic Bradykinesia besides Parkinson’s:

Please read the article on non-Parkinson’s causes of Bradykinesia. It describes 8 causes of slow movements.

The most important ones to remember are hypothyroidism and severe depression. The slowness of movements produced by these conditions can look the same as Parkinson’s disease.

3) Conditions that mimic shuffling gait seen in Parkinson’s:

Please read the article on shuffling gait. It describes 5 causes of shuffling of gait.

The most crucial mimic to remember is Normal Pressure Hydrocephalus (or NPH).

The person with NPH feels like he is stuck to the ground. This is a “magnetic gait”. It is easy to mistake this for Parkinson’s disease.

For example, see this video posted by the Hydrocephalus Association of America on youtube:

NPH can be treated by implanting a small shunt pipe. This shunt drains excess water around the brain into the abdomen.

Which test can be done when the diagnosis is in doubt?

I request a small set of tests on almost all patients I diagnose with Parkinson’s. These detect some (but not all) mimics of Parkinson’s disease.

Some doctors don’t request all these tests. And for a good reason.

The diagnosis of Parkinson’s mimics is primarily based on a careful history and examination.  Even in my practice, these tests change the diagnosis only in a minority of patients.

I like the additional confirmation provided by these tests. They also have other benefits. For example, they help me determine the proper dosages of medications like Amantadine.

Simple tests to detect Parkinson’s Mimics
1. MRI-Brain – with size measurements of brain parts called the midbrain and pons. I usually also request a unique picture called SWI, which shows iron inside the brain.

2. Blood tests:

    1. Complete blood count
    2. Liver function tests
    3. Renal function tests
    4. Thyroid hormone levels (TSH/T3/T4)
    5. Parathyroid hormone level
    6. Ceruloplasmin level & eye examination to look for a “ring of copper”
    7. Ferritin level
    8. HIV
    9. VDRL (Syphillis test)

But when the diagnosis s really in doubt, there is another brain scan that can be done.

A Trodat scan. Or even better – an F-DOPA scan. Both these scans measure dopamine activity inside the brain.

fDOPAcorrect
A TRODAT / fDOPA-PET scan can confirm Parkinson’s disease.

You can read more about Trodat & F-DOPA scans by clicking here.

These scans are not perfect. Let me tell you why very quickly:

In Parkinson’s disease, dopamine activity inside the brain is deficient. This deficiency produces an abnormal scan. If the Trodat/F-DOPA scan is normal, it is unlikely that you have Parkinson’s disease.

Unfortunately, an abnormal scan means that you either have Parkinson’s disease, or a mimic. This is because some (but not all) of these mimics can also produce abnormal scans.

Bottom-line:

Parkinson’s misdiagnosis is common.

There are 30+ diseases that can mimic Parkinson’s disease.

The exclusion of Parkinson’s mimics depends on you providing a detailed history and a thorough examination by your doctor.

Testing (especially a DAT scan or F-DOPA PET scan) may help in difficult cases.

 

Caution: This information is not a substitute for professional care. Do not change your medications/treatment without your doctor's permission.
Dr. Siddharth Kharkar

Dr. Siddharth Kharkar

Dr. Siddharth Kharkar has been recognized as one of the best neurologists in Mumbai by Outlook India magazine and India today Magazine. He is a board certified (American Board of Psychiatry & Neurology certified) Neurologist.

Dr. Siddharth Kharkar is a Epilepsy specialist in Mumbai & Parkinson's specialist in Mumbai, Maharashtra, India.

He has trained in the best institutions in India, US and UK including KEM hospital in Mumbai, Johns Hopkins University in Baltimore, University of California at San Francisco (UCSF), USA & Kings College in London.

Call 022-4897-1800

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2 thoughts on “What can mimic Parkinson’s disease? [30+ Parkinson’s Misdiagnoses]”

  1. I am frustrated with few answers. I am a 47 year old female that has had bladder retention for the last few years, shuffling gate and walking crooked as well as shoulder, arm and back stiffness/pain, memory loss. After having Covid a year ago October my symptoms have progressed to burning, numbness, tingling, eye blurriness, fatigue, pain, imbalance, tremors and a horrible memory. I have been going to Dr.s, a chiropractor and recently a neurologist for the last few months. My only diagnosis so far is low vitamin D, low iron and being dopamine deficient. How do you determine how much dopamine you have lost and why is it not diagnosed as parkinsons when there are so many of the symptoms?

    Reply
    • All tests need to be correlated to clinical symptoms. Even if a test is positive, it does not mean that a person has the disease.

      Let me give you a simple example – If I have a genetic test that shows that I have the breast cancer gene (BRCA1/BRCA2), but do not have breast cancer – then I do NOT have breast cancer.

      I think it would be reasonable for you to get a second opinion regarding your symptoms for another neurologist, perhaps at an Academic Center (University) to find out the cause for your symptoms. That will certainly be more helpful than a quick test to check for dopamine levels in the brain.

      I hope that helps, and you find a doctor that you are comfortable with and who finds the reason for your symptoms and an effective cure :)

      Reply

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