Hypotonia: Causes, Symptoms, and Treatment
Medically reviewed by Harsha Moole, MD, Internal Medicine. Last reviewed: October 23, 2026.
What kind of doctor treats Hypotonia?
A neurologist, a doctor who treats brain and nerve disorders, will usually help find the cause of hypotonia. A geneticist, a doctor who treats inherited conditions, may help diagnose certain disorders. 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 hypotonia?
Hypotonia means decreased muscle tone. It can happen when the brain, spinal cord, nerves, or muscles are damaged. Muscle tone and movement involve the brain, spinal cord, nerves, and muscles. Hypotonia may be a sign of a problem anywhere along the pathway that controls muscle movement. The condition can affect children or adults. In babies it is also called floppy infant.
Symptoms
Infants with this problem seem floppy and feel like a "rag doll" when held. They rest with their elbows and knees loosely extended. Infants with normal tone tend to have flexed elbows and knees. A baby with low tone may have poor head control. The head may fall to the side, backward, or forward. Infants with normal tone can be lifted with an adult's hands under the armpits. Hypotonic infants tend to slip between the hands.
Causes and who gets it
Hypotonia can come from many different causes. Causes may include:
- Brain damage from lack of oxygen before or right after birth, or problems with brain formation.
- Disorders of the muscles, such as muscular dystrophy.
- Disorders that affect the nerves that supply muscles.
- Disorders that affect the ability of nerves to send messages to the muscles.
- Infections.
- Genetic or chromosomal disorders, such as Down syndrome and Prader-Willi syndrome.
- Being born with hypothyroidism.
- Poisons or toxins.
- Spinal cord injuries that occur around the time of birth.
How doctors diagnose it
Your health care provider will do a physical exam, including a detailed exam of the nervous system and muscle function. In most cases, a neurologist will help evaluate the problem. Geneticists may help diagnose certain disorders. Which tests are done depends on the suspected cause. Most of the conditions linked to it also cause other symptoms. These help make the diagnosis.
Treatment
Many of these disorders need ongoing care and support. Physical therapy may be recommended to help children improve their development. If a child also has other medical problems, a number of different specialists will help care for the child. Take extra care when lifting and carrying a person with hypotonia to avoid causing an injury.
When to see a doctor
Hypotonia is often a sign of a worrisome problem. Call 911 or go to the emergency room if a child or adult with low muscle tone has trouble breathing, faints, or has a sudden change in mental state. Also call 911 for sudden weakness or if the person cannot speak. For a baby or child, call 911 if the skin looks blue or grey, the child cannot eat or feed, or the child is very sleepy or hard to wake.
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. Either kind of doctor can do a first physical exam. They can also help coordinate care when several specialists are involved.
Common questions
What does floppy infant mean?
Floppy infant is another name for hypotonia in a baby. Infants with this problem seem floppy and feel like a "rag doll" when held.
What causes hypotonia?
Many problems can cause it, because it may be a sign of a problem anywhere along the pathway that controls muscle movement. Muscle tone and movement involve the brain, spinal cord, nerves, and muscles.
Which doctor checks for hypotonia?
In most cases, a neurologist, a specialist in brain and nerve disorders, will help evaluate the problem. Geneticists may help diagnose certain disorders.
What helps children with hypotonia?
Physical therapy may be recommended to help children improve their development. Many of these disorders need ongoing care and support.
How should I lift a person with hypotonia?
Take extra care when lifting and carrying a person with hypotonia to avoid causing an injury.
Sources
- MedlinePlus - Hypotonia
- National Institute of Neurological Disorders and Stroke - Glossary of Neurological Terms
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.
