Medically reviewed by Harsha Moole, MD, Internal Medicine. Last reviewed: October 2, 2026.

A hematologist, a doctor who specializes in blood disorders, usually manages this condition. Care may also involve an ear doctor, a nephrologist, and an eye doctor, with a primary care doctor coordinating visits. A direct primary care or concierge doctor can be a first stop for an evaluation and can refer you to a specialist when needed.

What it is

Myh9 related thrombocytopenia is a rare inherited blood condition. Thrombocytopenia means a low number of platelets, the small blood cells that help stop bleeding. When the MYH9 gene does not work correctly, platelets can be larger than normal and lower in number. Some people also develop hearing, kidney, or eye problems over time.

Symptoms

Many people have no symptoms and only learn of the condition from a routine blood test. When symptoms happen, they usually involve easy bleeding: frequent nosebleeds, bleeding gums, easy bruising, and heavy menstrual bleeding. Hearing loss, kidney problems, and cataracts can develop slowly in some people.

Causes and who gets it

The condition is caused by a mutation in the MYH9 gene, which carries instructions for a protein that helps platelets, kidney cells, and inner ear cells work. A child usually needs to inherit only one changed copy of the gene from one parent to have the condition.

How doctors diagnose it

Doctors often start with a complete blood count, which shows fewer and larger-than-normal platelets. They may also check kidney function, hearing, and vision. A genetic test can confirm the diagnosis.

Treatment

No treatment fixes the gene change; care focuses on managing bleeding risk and watching the ears, kidneys, and eyes. If bleeding happens, doctors can use medicines or platelet transfusions. Aspirin and ibuprofen are usually avoided because they increase bleeding. Regular hearing, kidney, and eye checks help catch changes early.

When to see a doctor

Talk to a doctor if you have frequent nosebleeds, easy bruising, bleeding gums, or heavy menstrual bleeding. Seek care right away for bleeding that will not stop, blood in the urine or stool, or a head injury.

How a direct primary care or concierge doctor fits in

A direct primary care doctor charges a flat monthly fee instead of billing insurance; a concierge doctor usually charges more and often works alongside insurance. Either can order blood counts, arrange screenings, and refer you to a hematologist when bleeding problems appear or the diagnosis needs confirming.

Common questions

For most people, it is a mild condition that mainly raises the risk of easy bleeding. Serious bleeding is uncommon. Some people develop hearing or kidney problems, which is why regular checkups matter.

Can I live a normal life with this condition?

Most people with this condition live normal, active lives. You may need to avoid contact sports or certain medicines that raise bleeding risk. Your doctor can help you decide what activities are safe for you.

Will my children inherit it?

If one parent has the gene change, each child has a chance of inheriting it. A genetic counselor can explain the pattern and offer testing options.

Why do my platelets look big if my count is low?

The MYH9 gene change makes platelets grow larger than normal. Automated machines can miscount large platelets, so the measured number may look lower than the real number. This is a known feature of the condition.

Sources

  1. NIH Genetic and Rare Diseases Information Center - Macrothrombocytopenia and granulocyte inclusions with or without nephritis or sensorineural hearing loss
  2. MedlinePlus Genetics - MYH9-related disorder
  3. MedlinePlus - Thrombocytopenia

Medical Disclaimer

This content is for general educational and informational purposes only and is not medical advice. It is not a substitute for professional medical advice, diagnosis, or treatment, and reading it does not create a doctor-patient relationship. Always seek the advice of your physician or another qualified health provider with any questions about a medical condition, and never disregard or delay seeking professional advice because of something you read here. If you think you may have a medical emergency, call 911 (or your local emergency number) immediately.