Skip to content
knowrare
HealthSignal
Your condition community

Living with Hyperprolinemia

Too much of the amino acid proline in the blood, which often causes no symptoms.

Understanding Hyperprolinemia

Hyperprolinemia is an excess of the amino acid proline in the blood, usually because the body does not break it down well.

There are two forms. In type I, proline is 3 to 10 times higher than normal and people often have no symptoms. Some have seizures, intellectual disability, or other nerve or mental health problems. Type II, with proline 10 to 15 times higher than normal, is more likely to involve seizures or intellectual disability. It can also occur with malnutrition, liver disease, or high lactic acid.

Signs & symptoms

Many people have no symptoms. When symptoms occur, GARD's summary describes:

  • Seizures
  • Intellectual disability
  • Other nervous system problems
  • Mental health problems

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

    Your doctor may refer you to a specialist who knows rare conditions.

  3. Ask which tests can help

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

Care & treatment

Care team
A doctor familiar with rare conditions, plus specialists as needed
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
Which type of hyperprolinemia do I have?
Does my child need monitoring or any treatment?
Would genetic testing help our family?

Quick facts

It generally occurs when proline is not broken down properly. It can also occur with malnutrition, liver disease, or conditions that raise lactic acid in the blood.

Also known as: proline hydrogenase deficiency; prolinemia

Patient organizations

Rare-disease groups that can help

Source: NIH GARD · HyperprolinemiaGARD ID 2847 · 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 Hyperprolinemia.

Explore the Hyperprolinemia blog

Explore research for Hyperprolinemia

Explore actively recruiting Hyperprolinemia studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Hyperprolinemia 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

Powered by HealthSpark, our AI chat helper

I can help you find recruiting Hyperprolinemia studies. Enter a ZIP code, address or city below and I'll look within 50 miles.

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

Get Signals for Hyperprolinemia

Stay in the loop with community stories and updates from medical researchers.

HealthStoryfor Hyperprolinemia

Create a living journal that talks back

HealthStory evolves private journaling with a living AI journal that talks back and asks thoughtful questions, helping you capture your Hyperprolinemia experiences more deeply and prepare for better conversations with your doctors and care team.

Start your journal

Your journal is private. Sharing your story publicly is a separate choice, made with Share your story above.