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Living with Hawkinsinuria

An inherited condition in which the body can't break down the amino acid tyrosine, with signs that start around weaning from breast milk.

Understanding Hawkinsinuria

Hawkinsinuria is an inherited disorder in which the body can't break down the amino acid tyrosine.

This leads to certain amino acids, such as hawkinsin, in the urine. Features usually appear when infants are weaned from breast milk and start formula.

Signs & symptoms

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

  • Poor weight gain and growth (failure to thrive)
  • Too much acid in the blood (acidosis)
  • Fine or sparse hair
  • Low muscle tone (hypotonia)

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 genetic specialists.

  3. Consider genetic testing

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

Care & treatment

Care team
Genetic specialists (geneticists)
Expert care
Ask about multidisciplinary care centers for rare conditions
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 rare disease patient organizations for support
  • 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 confirm a change in the HPD gene?
What diet changes help with tyrosine?
How should growth and blood acid levels be monitored?

Quick facts

Symptoms usually startNewborn and as an Infant
InheritanceAutosomal Dominant
GenesHPD

Changes in the HPD gene cause this condition. It is inherited in an autosomal dominant way, which means one changed copy of the gene is enough.

GeneticInherited Metabolic

Also known as: 4-alpha-hydroxyphenylpyruvate hydroxylase deficiency; 4-hppd deficiency; 4-hydroxyphenylpyruvic acid dioxygenase deficiency; hawkinsin high in urine; hpd-gene related hawkinsinuria

Patient organizations

Rare-disease groups that can help

Source: NIH GARD · HawkinsinuriaGARD ID 5668 · 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 Hawkinsinuria.

Explore the Hawkinsinuria blog

Explore research for Hawkinsinuria

Explore actively recruiting Hawkinsinuria studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Hawkinsinuria 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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