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Epidemiology, Treatment Patterns, and Healthcare Utilisation Costs of Essential Tremor in Japan: An Analysis of Insurance Claims Data

This retrospective study utilizing Japanese insurance claims data from 2016 to 2022 reveals that while essential tremor prevalence is rising among the elderly, treatment rates remain low with limited use of first-line beta-blockers, suggesting potential undertreatment and highlighting the condition's significant role in escalating healthcare costs for Japan's aging population.

Original authors: Keiichi Abe, Ataru Igarashi, Michael LoPresti, Masahiko Shinohara, Javier Sabater, Natasha Dzimitrowicz

Published 2026-06-28

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CC BY 4.0

Original authors: Keiichi Abe, Ataru Igarashi, Michael LoPresti, Masahiko Shinohara, Javier Sabater, Natasha Dzimitrowicz

Original paper licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). ✨ This is an AI-generated explanation of the paper below. It is not written or endorsed by the authors. For technical accuracy, refer to the original paper. Read full disclaimer

Imagine the human body as a complex, well-oiled machine. For most people, the hands, head, and voice stay steady when they try to hold a cup or speak. But for people with Essential Tremor (ET), this machine has a persistent, unwanted "shaking" glitch. It's not a disease that shortens life, but it can make daily tasks like eating, writing, or drinking feel like trying to thread a needle while riding a bumpy bus.

This research paper is like a massive financial and medical audit of Japan. The researchers didn't interview patients one by one; instead, they looked at the "receipts" (insurance claims) from over 12 million people to see how often this "shaking glitch" happens, how it's treated, and how much it costs the healthcare system.

Here is what the study found, broken down into simple concepts:

1. The "Shaking" is Mostly an "Older Adult" Problem

Think of the population as a giant library. The researchers found that the "shaking books" are almost entirely on the top shelves, reserved for people over 70.

The Trend: The number of new cases peaked in 2019 but has been rising steadily overall.
The Age Factor: The older you get, the more likely you are to have this condition. By the time people are in their 80s, the "shaking" is much more common.
The Gender Twist: In many other countries, men seem to shake more. But in Japan, the data showed slightly more women with the condition. The authors suggest this might be because women in Japan are more likely to visit the doctor to get a "receipt" for their symptoms, while men might just ignore the shaking or not get diagnosed.

2. The "Under-Recognized" Glitch

The study found that the number of people diagnosed with ET in Japan is surprisingly low compared to Western countries (like the US or Germany).

The Analogy: Imagine a room full of people with a mild cough. In the US, a doctor might write down "cough" for everyone. In Japan, the study suggests many people with the "shaking" might not be getting that note written down.
Why? The shaking might be mild, or people might think it's just "old age." Also, there aren't as many specialized "mechanics" (neurologists) in regional areas to spot the specific type of shake. The researchers suspect many cases are going undiagnosed and untreated.

3. The "Wrong Tool" for the Job

When patients do get diagnosed, the treatment they get is a bit like using a sledgehammer to crack a nut, or using a screwdriver when you need a wrench.

The Rulebook: Medical guidelines say the first tool to use should be a specific type of blood pressure pill (beta-blockers).
The Reality: In Japan, doctors are mostly prescribing anti-anxiety pills (benzodiazepines) and seizure medications (anticonvulsants).
The Missing Piece: The specific blood pressure pill approved for this shaking in Japan is rarely used. The researchers think doctors might be avoiding it because it can lower blood pressure too much in elderly patients, so they reach for the other drugs instead.
Surgery? Very few people get the "big fixes" like brain surgery or focused ultrasound. It's like trying to fix a shaking hand with a sledgehammer; most people just stick to the pills.

4. The "Bundle of Woes" (Comorbidities)

People with this shaking rarely have just the shaking. They usually have a whole "bundle of other issues."

The Common Pairings: High blood pressure, pain, and high cholesterol are the most frequent companions.
The Mental Link: The study found that if a patient also has depression or high blood pressure, they are much more likely to actually start taking medication for the shaking. If they don't have these other issues, they might just live with the shaking without treatment.

5. The Cost of the "Shake"

How much does this cost the Japanese healthcare system?

The Outpatient Bill: Most people don't end up in the hospital (the "emergency room" for the shaking). Instead, they visit their regular doctor (General Practitioner) a lot. About two-thirds of patients visit their doctor 5 or more times a year.
The Price Tag: In the first year after diagnosis, the average cost per person was about 248,000 Yen (roughly $1,500). By the second year, it jumped to 366,000 Yen (roughly $2,200).
The Real Cost: The study notes that this cost isn't just for the shaking. It's for the whole package of the patient's health. Since the shaking usually starts around age 60, it often arrives right when other expensive problems (like heart failure, dementia, or diabetes) start showing up.
The Metaphor: The diagnosis of Essential Tremor acts like a canary in a coal mine. It's often the first sign that a person's "machine" is entering a phase where multiple systems are starting to wear out, leading to a sharp rise in overall healthcare costs.

The Bottom Line

This study is the first big look at the "shaking" problem in Japan using real-world insurance data. It tells us that:

The condition is likely under-diagnosed (many people have it but don't know it).
When it is treated, doctors often use different drugs than international guidelines suggest.
The condition is a strong signal that a person is entering a phase of life where healthcare costs will rise, not just because of the shaking, but because of the other health issues that tend to arrive at the same time.

The researchers conclude that we need to get better at spotting this "glitch" early and treating it properly, not just for the shaking itself, but because it might be the first warning sign of a broader health decline in Japan's aging society.