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Living with Tyrosinemia type I

A genetic condition in which an enzyme shortage lets tyrosine build up, affecting the liver, kidneys, bones, and nerves from infancy.

Understanding Tyrosinemia type I

Tyrosinemia type I is a genetic condition with high blood levels of the amino acid tyrosine because of an enzyme shortage.

Symptoms usually appear in the first few months of life. The condition can lead to liver and kidney problems, softening and weakening of the bones, nervous system problems, and a higher chance of liver cancer. It can be noticed at any time in life.

Signs & symptoms

Symptoms vary from person to person. GARD describes these features:

  • Poor weight gain and growth (failure to thrive)
  • Diarrhea and vomiting
  • Yellow skin and eyes (jaundice)
  • Cabbage-like odor
  • Easy bleeding, especially nosebleeds
  • Enlarged liver

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 brain and nervous system specialists, cancer specialists, digestive system specialists and genetic specialists.

  3. Consider genetic testing

    Changes in FAH are linked to this condition. Genetic testing and counseling can help confirm a diagnosis and explain what it means for your family.

  4. Connect with expert centers

    The Foundation for Peripheral Neuropathy may keep lists of experts for this condition.

Care & treatment

Care team
Brain and nervous system specialists (neurologists); Cancer specialists (oncologists); Digestive system specialists (gastroenterologists); Genetic specialists (geneticists)
Expert care
Expert lists: The Foundation for Peripheral Neuropathy
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 flok 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
Can genetic testing of the FAH gene confirm this diagnosis?
Which treatment and diet are recommended?
How often should the liver, kidneys, and bones be checked?

Quick facts

Symptoms usually startany time in life
InheritanceAutosomal Recessive
GenesFAH

This condition is caused by changes in the FAH gene. It is autosomal recessive, so a child inherits a changed copy of the gene from each parent.

GeneticNeurologicalKidneyGastrointestinalInherited Metabolic

Also known as: deficiency of beta-diketonase; deficiency of fumarylacetoacetase; fah deficiency; fah-gene related tyrosinemia type 1; fumarylacetoacetase deficiency; fumarylacetoacetate hydrolase deficiency

Patient organizations

Source: NIH GARD · Tyrosinemia type IGARD ID 2658 · 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 Tyrosinemia type I.

Explore the Tyrosinemia type I blog

Explore research for Tyrosinemia type I

Explore actively recruiting Tyrosinemia type I studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Tyrosinemia type I 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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