Restless Legs Syndrome — Tingling, itching, and a sensation like bugs crawling inside

1. The Unbearable Discomfort Beginning in Your Legs

At the end of the day, the moment you turn off the lights and lie down. Your body is clearly resting, but your legs just can't.

They tingle, itch, feel like insects crawling inside, or like something is constantly creeping up from deep within your bones, making it impossible to endure without moving your legs.

Moving them helps, but it doesn't fully resolve the issue. If you stay still again, it starts all over. When this repeats, sleep is disrupted, you're tired during the day, and not just your legs, but your whole life becomes exhausting.

2. You Visit the Hospital, But Are Told, “It’s Normal”

So you visit a hospital. Whether it's a neurologist or an orthopedist, you undergo blood tests, nerve conduction studies, and even disc exams...

“There's nothing wrong. No particular abnormalities.” Hearing this provides temporary relief, but when you return home and night falls again, the symptoms recur.

“Could it be a psychological issue?” “It might be lack of exercise.” Ultimately, patients are left in a state where they clearly feel something is wrong with their body, yet no medical condition is identified.

3. Restless Legs Syndrome Clearly Exists – But Its Diagnostic Criteria Are Narrow

Restless Legs Syndrome (RLS) is a globally recognized condition. The World Sleep Society classifies it as a type of sleep-related movement disorder, and the International Restless Legs Syndrome Study Group (IRLSSG) provides clear diagnostic criteria.

• A strong urge to move the legs
• Worsens during rest
• Temporarily relieved by movement
• Worsens in the evening or at night
• Not explained by another medical condition

Diagnosis is possible if all five of these conditions are met. The problem is that many people don't perfectly fit these criteria.

The sensations are definitely abnormal, but the 'urge to move' might be vague, or it might occur in the morning instead of at night, or movement doesn't provide immediate relief. As a result, hospitals may withhold a diagnosis, stating that it "doesn't meet the criteria," and patients are left to continue suffering without a clear diagnosis.

4. Therefore, We Diagnose Backwards Based on Treatment Response – The Reality of Retrospective Diagnosis

Even if they don't perfectly meet the diagnostic criteria, many patients present with clear symptoms. In such cases, healthcare professionals often use a method called 'retrospective diagnosis.'

For instance, if symptoms significantly decrease after trying a low-dose dopamine agonist, or if abnormal sensations disappear after checking ferritin levels and providing iron supplementation, then it's belatedly concluded, "Ah, this must have been RLS."

However, this is merely a post-hoc diagnosis dependent on drug response, and it also implies a lack of a system that can clearly explain the underlying structure from the outset.

5. Why Does Movement Help? — The Delicate Balance Between Sensory and Motor Circuits

What makes this symptom intriguing is precisely that 'movement improves it.' Why movement, specifically?

From a neurophysiological perspective, RLS is interpreted as a breakdown of the autonomous inhibitory loop between the somatosensory cortex and motor circuits. When at rest, the sensory circuit becomes abnormally excited, and the dopamine system, which should inhibit this, fails to function properly.

But what happens with movement? Dopamine secretion is temporarily promoted, and various sensory stimuli flood in, temporarily 'overloading' the brain with these signals → as a result, sensory hypersensitivity is alleviated.

In other words, it's not simply a matter of perception, but a structural mechanism where the brain itself readjusts sensory stimuli through movement.

6. Yet, Some People Develop Symptoms for the First Time After Surgery

One common statement heard in clinical practice is, "My legs have been strange ever since my back surgery." or "I never had this before, but after the surgery, I can't stand it when I lie down to sleep at night."

This could be neuropathic paresthesia, or central sensitization resulting from the sensory pathway readjustment process following nerve damage.

Spinal surgery actually alters the flow of sensory nerves. As a result, the circuits that inhibit sensation in the central nervous system can become unbalanced, leading to previously absent sensory hypersensitivity. To simply dismiss this as "post-surgical sequelae" often overlooks the many cases that show patterns very similar to RLS.

7. At This Point, A Question Arises — How Does Traditional Korean Medicine View This?

How does Traditional Korean Medicine (TKM) interpret these abnormal sensations? First, the liver stores blood and governs the muscles and meridians. Thus, it's believed that if liver blood (Gan-hyeol) is deficient, the muscles and sensory system of the lower limbs cannot function properly.

Furthermore, if the heart and mind (Shim-shin) are unsettled, or if phlegm-fire (Dam-hwa) flares upwards, the body tries to rest at night while the mind and nerves remain continuously active. This is explained as 'unsettled heart and mind' (Shim-shin-bul-an) or phlegm-fire.

The sensation that cannot be endured without movement also aligns with the concept of 'internal wind' (Nae-pung) in TKM. If there is yin deficiency with internal heat (Eum-heo nae-yeol) or weakened liver and kidney yin (Gansin-ui eum), 'wind' arises within the body, and this 'wind' generates the movement.

8. Japanese Kampo Medicine Adds the Concept of ‘Neural Sensitization’ Here

In Japanese Kampo medicine, this condition is explained from the perspective of neural hypersensitivity (sensitization). Simply put, it's a state where the brain reacts to sensations much more sensitively than usual.

From this perspective, a frequently used formula is Chaihu Jia Longgu Muli Tang (Bupleurum, Dragon Bone, and Oyster Shell Decoction). This describes a state where the HPA axis is overactivated by stress, leading to the autonomic nervous system maintaining a state of tension, causing sensory signals to be excessively amplified and transmitted to the brain.

Here, dragon bone and oyster shell have nerve-calming effects; Scutellaria root and Jujube reduce heat and calm 'heart fire'; and Bupleurum and Pinellia regulate 'liver qi' (Gan-gi) and disperse phlegm (Dam). Other formulas, such as Sanjoin-tang (Ziziphus Spinosa Seed Decoction) and Gami-ondam-tang (Augmented Wen Dan Tang), are often applied with a similar structure to supplement the function of the GABAergic inhibitory system.

9. When Medications Fail and Criteria Aren’t Met, That’s When Traditional Korean Medicine Becomes Even More Necessary

The reality is this: many people find that dopamine medications don't work or even worsen their symptoms after taking them. Many also have normal ferritin levels yet still experience abnormal sensations.

Just because a condition doesn't perfectly fit diagnostic criteria doesn't mean it's not a disease. It is precisely at this point that the interpretive power of Traditional Korean Medicine is needed to explain the world of undiagnosed sensations.

Symptoms that improve with movement, worsen at night, are linked to emotional fluctuations, and describe a state where the body appears fine but the nerves seem 'broken.' Instead of saying such situations "belong nowhere," TKM has the potential to explain them through the interactions of the Liver, Heart, and Kidney (Gan, Shim, Shin), and the disharmony of Wind, Phlegm, and Blood (Pung, Dam, Hyeol).

Restless Legs Syndrome is not simply a condition of leg discomfort. It is a complex disorder where sensory hypersensitivity, emotional instability, sleep disruption, and motor urges converge.

For those who slip through the diagnostic net, who don't improve with medication, and who are more anxious because they don't know why—what they need isn't just another drug, but a new language and interpretive power to explain their sensations and suffering. Traditional Korean Medicine can stand in that place.