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Living with Methylmalonic acidemia

A group of inherited conditions in which the body can't properly break down proteins and fats, usually showing up in infancy.

Understanding Methylmalonic acidemia

Methylmalonic acidemia is a group of inherited disorders that prevent the body from properly breaking down proteins and fats.

Effects usually appear in early infancy and range from mild to severe. Babies may have vomiting, dehydration, weak muscle tone, delays, low energy, an enlarged liver, and slow growth. Long-term issues can include feeding problems, intellectual disability, movement problems, chronic kidney disease, and pancreatitis (inflamed pancreas). Episodes of too much acid in the blood (metabolic acidosis) can be serious.

Signs & symptoms

GARD doesn't list a separate symptom list, but its summary describes these:

  • Vomiting and dehydration
  • Weak muscle tone (hypotonia)
  • Developmental delay
  • Low energy (lethargy)
  • Enlarged liver
  • Slow growth and weight gain

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 Organic Acidemia Association
  • 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 methylmalonic acidemia do I or my child have?
What diet and sick-day plan should we follow?
How should the kidneys and pancreas be monitored?

Quick facts

GARD says it is a group of inherited disorders that prevent the body from breaking down proteins and fats properly. It does not name genes in this record.

Also known as: elevated circulating methylmalonic acid concentration; isolated methylmalonic acidemia; methylmalonic aciduria; mma; mma - methylmalonic aciduria

Patient organizations

Source: NIH GARD · Methylmalonic acidemiaGARD ID 7033 · GARD page updated September 2026 · Plain-language summary by Know Rare; editorial review pending. General information, not medical advice.

Explore research for Methylmalonic acidemia

Explore actively recruiting Methylmalonic acidemia studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Methylmalonic acidemia 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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