Microtia: Causes, Symptoms, and Treatment
Medically reviewed by Harsha Moole, MD, Internal Medicine. Last reviewed: October 23, 2026.
What kind of doctor treats Microtia?
An ear, nose, and throat doctor, a specialist in ear conditions, and a plastic surgeon, a doctor who rebuilds body parts, usually care for microtia together. A pediatrician, a children's doctor, can help you reach these specialists. 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 is microtia?
Microtia is a condition present at birth in which the outer ear is underdeveloped. The ear can range from slightly small to completely missing. Anotia is the most severe form, when the ear is completely missing.
Microtia usually affects one ear. It also happens more often in males.
Symptoms
The main sign is an outer ear that is small, oddly shaped, or missing. Doctors often sort microtia into grades, and the Marx system is widely used.
- Grade I: The ear is slightly smaller than usual, but all its parts are present.
- Grade II: The ear is smaller, and some parts are underdeveloped or missing.
- Grade III: Only a small piece of ear cartilage is present. This is the most common type, often called "peanut ear."
- Grade IV: The ear is completely missing, which is called anotia. The ear canal is also missing in this grade.
Conductive hearing loss, which happens when sound cannot pass well through the ear, is common. Some children also have aural atresia, which means the ear canal and middle ear did not form. The ear canal is often closed or narrow. The more severe the outer ear difference, the more likely the middle ear is also different.
Microtia can also come with other differences, such as hearing loss, an uneven face, heart defects, or kidney problems. Children with microtia may face a higher risk of low self-esteem and bullying.
Causes and who gets it
Experts think microtia may come from problems with blood supply to the growing ear or from exposure to medicines during pregnancy. Isotretinoin, thalidomide, alcohol, and mycophenolate mofetil can also cause it.
Microtia can happen alone. It can also be linked to genetic conditions such as Goldenhar, Treacher Collins, and CHARGE syndromes. It can occur with no family history.
Other risk factors include older parents, living at high altitude, and low birth weight. It is more common among Asian, Pacific Islander, and Hispanic people in the United States.
How doctors diagnose it
Microtia is present at birth and may be found during a newborn exam. Doctors also check the head and neck, including the jaw, mouth, palate, eyes, and facial nerve.
Hearing should be tested early in a baby with microtia. The other ear needs testing too, because its hearing should not be assumed normal.
A CT scan of the temporal bone, a skull bone near the ear, helps grade aural atresia. It should wait until age 6. This is because CT radiation may have health risks for young children.
Treatment
Care ranges from watching the ear to a prosthetic ear to surgery. A minor ear difference may not need correction. The plan depends on age, how severe the microtia is, other health problems, and what the family wants.
- Hearing devices: A bone-anchored hearing aid can treat conductive hearing loss.
- Prosthetic ear: An artificial ear can be attached with adhesive, clips, or magnets. Costs can be very high, and a young child may lose it.
- Rib cartilage surgery: Surgeons build an ear frame from the child's own rib cartilage. It is done in 2 to 4 stages. Many surgeons wait until age 10 so there is enough cartilage.
- Plastic implant surgery: A plastic implant can be used in children as young as 3 to 5 years. Infection and the implant working through the skin are more likely in this age group.
Ear surgery can cause pain, bleeding, swelling, infection, scarring, and damage to nearby structures. Taking rib cartilage can cause a collapsed lung. Ear reconstruction should be done by an experienced team that does many of these surgeries.
Counseling and emotional support may also help.
When to see a doctor
Children with hearing loss are more likely to have speech delays. So infections in the other, normal ear should be treated promptly.
See a doctor soon if your baby has an ear that looks small or missing, so hearing can be checked early.
How a direct primary care or concierge doctor fits in
A direct primary care doctor charges a flat monthly fee instead of billing insurance, while a concierge doctor usually charges more and often works alongside insurance. A direct primary care doctor can look at your child's ears, arrange a hearing test, and refer you to an ear, nose, and throat doctor or a plastic surgeon. They can also help coordinate care among these specialists.
Common questions
Does microtia cause hearing loss?
Often, yes. It often goes along with a closed or narrow ear canal.
Can microtia be fixed?
Yes, the look of the ear can often be improved. Surgery to rebuild the ear or a prosthetic ear can improve appearance and function.
At what age is microtia surgery done?
It depends on the type of surgery. Many surgeons wait until age 10 for rib cartilage surgery. A plastic implant can be used earlier, at about 3 to 5 years.
Can microtia be prevented?
Some steps may help. Good prenatal care, avoiding known harmful exposures, and genetic counseling for families with a history of microtia may lower the chance.
Can people with microtia live a normal life?
Yes, most people without a related genetic condition can.
Sources
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.
