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Itai-Itai Disease: Causes, Symptoms and Treatment

Itai-Itai disease is a severe chronic cadmium poisoning that causes painful bone softening, fractures, and kidney damage, first documented in Japan.

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Itai-Itai disease is a severe chronic cadmium poisoning that causes painful bone softening, fractures, and kidney damage, first documented in Japan.

What Is Itai-Itai Disease?

Itai-Itai disease (Japanese for "ouch-ouch disease") is a severe chronic illness caused by long-term exposure to cadmium, a toxic heavy metal. It was first identified in Japan in the Toyama Prefecture along the Jinzu River, where mining operations contaminated irrigation water and rice paddies with cadmium. The name reflects the intense pain that patients experienced with even the slightest movement.

Causes

The disease results from chronic cadmium poisoning (cadmium intoxication). Cadmium is a naturally occurring heavy metal that enters the environment primarily through industrial activities such as mining, metal smelting, and battery manufacturing.

Contaminated drinking water from mining runoff
Consumption of cadmium-contaminated food, especially rice and vegetables irrigated with polluted water
Inhalation of cadmium-containing dust in industrial settings
Long-term, low-dose exposure accumulated over many years

Postmenopausal women with calcium deficiency were particularly vulnerable, as cadmium disrupts the metabolism and absorption of calcium and phosphate in the body.

Symptoms

Symptoms of Itai-Itai disease develop gradually over many years and primarily affect the kidneys and the musculoskeletal system.

Kidney Damage

Proteinuria: excessive protein excretion in the urine
Glucosuria (glucose in the urine despite normal blood sugar levels)
Aminoaciduria (elevated amino acid excretion in the urine)
Progressive renal insufficiency (reduced kidney function)

Bone Damage

Osteomalacia: softening of the bones due to impaired mineralization
Osteoporosis: reduced bone density with increased fracture risk
Spontaneous fractures, particularly of the spine and ribs
Severe, generalized skeletal pain with any movement
Skeletal deformities and reduction in body height

General Symptoms

Severe fatigue and general weakness
Waddling gait due to skeletal deformities
Anemia (reduced red blood cell count)

Diagnosis

Diagnosis is based on a combination of clinical findings, laboratory tests, and a thorough history of cadmium exposure.

Measurement of cadmium levels in urine and blood
Urinalysis for proteinuria, glucosuria, and aminoaciduria
Kidney function markers (creatinine, GFR)
X-rays and bone density measurement (DXA scan)
Blood tests for calcium, phosphate, vitamin D, and parathyroid hormone

Treatment

There is no specific treatment capable of fully removing cadmium from the body, as cadmium has a very long biological half-life of 10 to 30 years in the human body. Treatment is therefore primarily symptomatic and supportive.

Cessation of exposure: immediate and permanent removal from cadmium sources
Calcium and vitamin D supplementation to treat osteomalacia
Phosphate supplementation when indicated
Management of kidney insufficiency (dietary measures, dialysis in advanced cases)
Pain management to relieve bone pain
Physiotherapy to maintain mobility

Chelating agents such as EDTA have been investigated but show limited effectiveness against cadmium poisoning and may worsen kidney damage in patients with pre-existing renal impairment.

Prevention and Public Health Significance

Itai-Itai disease is recognized as one of the first documented cases of large-scale environmental poisoning with major public health consequences. It prompted landmark environmental protection legislation in Japan. Prevention relies on strict regulatory limits for cadmium in food, drinking water, and occupational environments. The World Health Organization (WHO) and the European Food Safety Authority (EFSA) have established tolerable weekly intake values for dietary cadmium exposure.

References

Nogawa, K. & Kido, T. (1993): Itai-itai disease and exposure to cadmium. In: Environmental Research, 68(2), 95-102.
World Health Organization (WHO): Cadmium - Environmental Health Criteria 134. Geneva, WHO Press.
Satarug, S. et al. (2010): Cadmium, environmental exposure, and health outcomes. In: Environmental Health Perspectives, 118(2), 182-190.

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