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Living with Satoyoshi syndrome

A rare condition with painful muscle spasms, digestive absorption problems, hair loss, short height, and bone differences.

Understanding Satoyoshi syndrome

Satoyoshi syndrome is a rare condition marked by progressive, painful, on-and-off muscle spasms.

Other symptoms can include diarrhea and trouble absorbing certain foods, especially carbohydrates. People may lose hair on the head and body (alopecia universalis), be short, and have bone differences. Women may not have periods. It begins anywhere from childhood to adulthood.

Signs & symptoms

Symptoms vary from person to person. GARD lists these among the most common:

  • Painful, on-and-off muscle spasms
  • Total hair loss (alopecia universalis)
  • Absent periods (amenorrhea)
  • Bone and joint differences
  • Small head size (microcephaly)
  • Bowed legs

Not everyone has every symptom. GARD's list comes from the Human Phenotype Ontology.

Diagnosis

  1. Talk with your doctor

    Share the symptoms you've noticed, when they started and your family health history. Notes and photos can help.

  2. See a specialist

    Specialists who may be involved include autoimmune and inflammatory disease specialists, digestive system specialists, hormone specialists and maternal-fetal medicine specialists.

  3. Ask which tests can help

    Your care team will decide which exams and tests can confirm the diagnosis.

  4. Connect with expert centers

    Dystonia Medical Research Foundation may keep lists of experts for this condition.

Care & treatment

Care team
autoimmune and inflammatory disease specialists (rheumatologists); Digestive system specialists (gastroenterologists); Hormone specialists (endocrinologists); Maternal-fetal medicine specialists (pregnancy-related)
Expert care
Expert lists: Dystonia Medical Research Foundation
Treatment
GARD doesn't list specific treatments for this condition. Your care team will tailor care to your symptoms.
Research
Clinical trials and observational studies may be options. See the research section below.

General information, not medical advice. Your care team makes the decisions.

Everyday life

Living with a rare condition is easier with support.

  • Connect with Dystonia Medical Research Foundation and other patient organizations
  • Keep notes on symptoms, changes and questions for appointments
  • Ask about patient registries that help research
  • Look into financial aid and travel resources for care visits
Bring these questions to your next doctor visit
What tests help confirm this diagnosis?
What treatments may help with muscle spasms?
Should digestion and nutrition be monitored?

Quick facts

Symptoms usually startfrom Childhood to Adulthood

GARD says the exact cause is unknown.

EndocrineGastrointestinalSkinUrinary and Reproductive

Also known as: komuragaeri disease

Patient organizations

Source: NIH GARD · Satoyoshi syndromeGARD ID 160 · GARD page updated September 2026 · Plain-language summary by Know Rare; editorial review pending. General information, not medical advice.

You are more than your diagnosis

Perspectives from people navigating life with Satoyoshi syndrome.

Explore the Satoyoshi syndrome blog

Explore research for Satoyoshi syndrome

Explore actively recruiting Satoyoshi syndrome studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Satoyoshi syndrome with HealthSpark. Share your city to explore research near you.

  • Recruiting studies from ClinicalTrials.gov
  • Share your city to look for research near you
  • Eligibility is confirmed by the study team

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Powered by HealthSpark, our AI chat helper · Study information from ClinicalTrials.gov · Eligibility is confirmed by the study team.

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