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Angelman Syndrome

A rare genetic condition affecting the nervous system — development, speech, movement, sleep and seizures — often with a joyful, sociable personality.

What is Angelman syndrome?

Angelman syndrome (AS) is a rare genetic condition that mainly affects the nervous system (MedlinePlus Genetics). It is caused by a loss of function of a gene called UBE3A on chromosome 15. In most of the brain, only the copy of this gene inherited from the mother is switched on, so when that copy is missing or changed, the brain has no working copy (MedlinePlus Genetics). Most cases are not inherited and happen by chance; families usually have no history of the condition (MedlinePlus Genetics).

Angelman syndrome affects an estimated 1 in 12,000 to 20,000 people (MedlinePlus Genetics, NORD), boys and girls equally, and many cases are thought to go undiagnosed (NORD). Because its signs overlap with autism, cerebral palsy and Prader-Willi syndrome, it is often misdiagnosed at first (Angelman Syndrome Foundation).

Common signs

How it is diagnosed

Doctors suspect AS from a child’s development and signs, and confirm it with blood-based genetic tests (ASF). A DNA methylation test confirms about 80 percent of cases; further tests (such as a chromosomal microarray or FISH, and sequencing of the UBE3A gene) can then find the specific genetic cause (NORD, ASF). About 70 percent of cases come from a missing piece of the mother’s chromosome 15, and about 10 to 20 percent from a change in the mother’s copy of UBE3A (MedlinePlus Genetics). Genetic counseling is recommended for families (NORD).

Living with Angelman syndrome

There is no cure yet, and current care focuses on symptoms and support (NORD). But much can help: seizure care, sleep support, physical, occupational and speech therapy, and communication tools. Life expectancy appears to be nearly normal (MedlinePlus Genetics), and with lifelong care people with AS can live long, happy lives (ASF).

Research is moving. Several investigational medicines called antisense oligonucleotides (ASOs) are being tested in phase 3 clinical trials. They aim to switch on the father’s copy of UBE3A, which is normally silenced in the brain (FAST), and are given by injection into the spinal fluid (ClinicalTrials.gov). These remain experimental: they are still being studied for safety and effectiveness, and families should talk with their care team before considering a trial. Learn more below, under conventional medicine.

Call 911 if a seizure lasts longer than 5 minutes, another seizure follows soon after, the person has trouble breathing or doesn’t wake up normally, is injured, or the seizure happens in water (CDC). Ask your neurologist for a written plan for your child’s seizures.

Side by side

Six approaches compared

For every condition we look at the same six approaches: what each involves, what it typically costs, and what a patient can realistically expect.

ApproachWhat it involves Estimated costWhat to expect
Conventional medicine (AMA) A team approach: a neurologist for seizures and sleep, physical, occupational and speech therapy with communication devices (AAC), feeding and digestive care, eye exams, scoliosis checks, behavioral support, and early intervention and special education. Without insurance, speech therapy runs about $100–$250 an hour and occupational therapy $50–$400 an hour, plus $150–$250 evaluations. Early intervention under age 3 is free or reduced-cost; school services are free under IDEA; Medicaid covers medically necessary care for enrolled children. No cure yet, but seizures and sleep often improve with age, many children learn to communicate with AAC, and life expectancy is nearly normal. Investigational ASO medicines are in phase 3 trials.
Chiropractic No research on chiropractic care for Angelman syndrome. Not applicable. Unknown — not a treatment for AS. Scoliosis needs regular medical follow-up.
Acupuncture Being researched — coming soon.
Herbal medicine No herb or supplement has been shown to help Angelman syndrome. Not applicable. Some herbs can interfere with seizure medicines or make seizures more likely. Always check with your neurologist and pharmacist first.
Massage therapy Being researched — coming soon.
MBHA Wellness Coach Family-centered support: sleep routines, water and wandering safety, seizure first aid, caregiver well-being and respite, connecting with Angelman family organizations, and finding help paying for care (Medicaid waivers, SSI, grants). Cost estimate being researched. Many supports named here — early intervention evaluations, family organizations’ resources, foundation grants — are free to apply for. Supports — never replaces — your child’s medical and therapy team.

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Conventional medicine (AMA)

Angelman syndrome is best cared for by a team that knows the condition. The Angelman Syndrome Foundation recommends a multidisciplinary team, ideally including a clinic in its ASF Clinical Network (ASF, ASF). Treatment is aimed at symptoms and support (NORD).

1. Seizure care

Seizures are usually treated with anti-seizure medicines, with regular neurology visits to monitor and adjust them (ASF). One medicine is often enough, but some people need more than one, and no single medicine is best for everyone (NORD). We don’t list medicines or doses; your child’s neurologist will tailor them.

2. Sleep

Sleep care starts by looking for health problems that disturb sleep, then uses behavioral strategies, with a neurologist or sleep specialist involved when needed (ASF). Consistent bedtime routines are recommended, and medicines are sometimes used (NORD).

3. Physical, occupational and speech therapy

What the research says: a 2021 review of 15 studies found that most research on rehabilitation in AS is about AAC, with smaller studies of physiotherapy, behavioral therapy and toilet training. Children did learn to communicate with AAC, but the studies were small, no single approach could be recommended over another, and the authors advised a personalized program combining several approaches (systematic review, Neurology International).

4. Behavior

Behavioral therapies such as applied behavior analysis (ABA) may help with sleep, hyperactivity and anxiety (ASF).

5. Feeding, digestion and eyes

  • Infants with feeding trouble may be helped by special feeding techniques and nipples. Reflux may be managed with upright positioning or medicines, and constipation with laxatives (NORD). A gastroenterologist or dietitian can advise on diet (ASF).
  • Regular eye exams are advised, because crossed eyes and other vision problems are possible (ASF).

6. Scoliosis and growing up

Scoliosis can develop with age and may need bracing or surgery (NORD). Reduced mobility can lead to weight gain and scoliosis in adolescence (ASF), so regular checks and staying active matter as children grow.

7. Early intervention and school

  • Under age 3: every state and territory runs a publicly funded early intervention program that provides services free or at reduced cost to eligible children. A doctor’s referral isn’t needed — you can call the program yourself and ask for an evaluation (CDC). This is Part C of the federal Individuals with Disabilities Education Act (IDEA), and services are planned in an Individualized Family Service Plan (IFSP) (ECTA Center).
  • Ages 3 to 21: under IDEA Part B, children with disabilities have the right to a free appropriate public education, planned in an Individualized Education Program (IEP) (ECTA Center). For a child 3 or older, call your local public elementary school and ask for an evaluation (CDC).
  • In California, early intervention is called Early Start and is arranged through regional centers and local school districts. Evaluation, assessment and service coordination are free; insurance is used for medically necessary therapies, and the regional center or school district covers services insurance doesn’t (California DDS).

8. Clinical trials

Several antisense oligonucleotide (ASO) medicines have reached phase 3 trials (FAST). They are designed to stop the father’s copy of UBE3A from being silenced, so the brain can make the missing protein (FAST). As of October 2026, ClinicalTrials.gov lists phase 3 studies of obudanersen (Ionis) (ClinicalTrials.gov), GTX-102 (Ultragenyx) (ClinicalTrials.gov) and rugonersen (ClinicalTrials.gov). Gene therapies and other approaches are at earlier stages (FAST). None of these is yet a standard treatment; NORD notes that no curative or genetic therapy is currently available (NORD). FAST and the Angelman Syndrome Foundation keep families updated on studies (FAST, ASF).

What it costs

  • Speech therapy without insurance: about $200–$250 for an initial assessment, then roughly $100 to nearly $250 an hour (CostHelper).
  • Occupational therapy without insurance: about $150–$200 for an evaluation, then $50–$400 an hour depending on the provider; hospitals tend to charge more (CostHelper).
  • With insurance: expect copays or 10–50 percent coinsurance. Some private plans don’t cover therapy for developmental delays and limit the number of sessions, so check your policy (CostHelper).
  • Free or low-cost routes: early intervention under age 3 (CDC) and school-based services under IDEA (ECTA Center).
  • Medicaid: children under 21 enrolled in Medicaid are entitled to EPSDT, which covers medically necessary care to correct or improve health problems (Medicaid.gov). See the Wellness Coach section for Medicaid waivers and SSI.
  • Seizure medicines, communication devices, specialist visits and trial participation: cost estimate being researched.

What to expect

Angelman syndrome is lifelong, and people with AS need lifelong care. Sleep problems and seizures often become less severe with age (ASF), and with the right supports many children learn to communicate and take part in family and community life.

Find a medical doctor in our directory

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Chiropractic

We found no research on chiropractic care for Angelman syndrome. A 2021 review of rehabilitation in AS noted that many families report that alternative therapies (it lists, among others, cranial osteopathy, reflexology, hydrotherapy and music therapy) help well-being, but stressed that there is no scientific evidence for their use in AS (systematic review).

Scoliosis is common in AS (MedlinePlus Genetics) and may need bracing or surgery (NORD), so spine problems should be followed by your child’s doctor. If you consider any hands-on spinal care, talk with your medical team first and tell the practitioner about seizures, scoliosis and any braces.

Find a chiropractor in our directory

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Herbal medicine

We found no herb or supplement shown to help Angelman syndrome. Because most people with AS take anti-seizure medicines, the bigger concern is safety.

Herbs and seizure medicines can clash. The Epilepsy Foundation warns that none of the traditional herbal remedies for seizures has been proven safe and effective, that some herbs may make seizures more likely, and that many can interact with seizure medicines (Epilepsy Foundation). St. John’s wort, for example, strongly affects how the body processes many medicines (NCCIH).

  • Many supplements have never been tested in children, so think carefully before giving them to a child (NCCIH).
  • “Natural” doesn’t always mean safe, and labels don’t always match what is in the bottle (NCCIH).
  • Tell your child’s neurologist and pharmacist about every supplement, vitamin or herbal product before starting it (NCCIH), and never stop or change a seizure medicine on your own.

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MBHA Wellness Coach

Caring for someone with Angelman syndrome is rewarding and demanding. An MBHA Wellness Coach can help the whole family with the everyday side of care — alongside, never instead of, your child’s doctors and therapists.

Sleep routines

Night waking, early waking and irregular sleep are common in AS. The Angelman Syndrome Foundation points families to behavioral approaches, changes to the sleep environment, and medical options when needed (ASF). Consistent bedtime routines are a recommended first step (NORD). A coach can help you build a routine that fits your family and keep a sleep log to share with your neurologist.

Water and wandering safety

Problems with walking and balance, combined with a strong attraction to water, can lead to serious accidents, so water safety is important (ASF).

  • Keep a responsible adult watching closely whenever a child is in or near water, including the bathtub; fence home pools on all four sides with self-closing, self-latching gates; and lock doors that open onto water (CDC).
  • Anyone with a seizure disorder should have one-on-one supervision around water, and showers can be safer than baths (CDC).
  • For children who may leave home unnoticed, Children’s National Hospital suggests door alarms or chimes, locks out of reach, an ID bracelet or tag (or ID programmed into a speech device), a recent photo and written safety plan, adaptive swimming lessons, and letting neighbors, school and local police know (Children’s National). Their advice was written for autism but is practical for any child at risk of wandering.

Seizure first aid for everyone who helps

Make sure grandparents, sitters and teachers know the basics: stay with the person, move things that could hurt them, turn them gently onto their side, time the seizure, and never put anything in their mouth (CDC). Know when to call 911 (see the alert at the top of this page).

Caring for the caregivers

  • Feeling isolated, overwhelmed or grieving after a diagnosis is common, and you are not alone; FAST connects newly diagnosed families with its community and with genetic counselors who know AS (FAST).
  • The Angelman Syndrome Foundation offers a resource library, a family registry, clinics and family support (ASF). NORD’s RareCare programs include caregiver respite help, and its helpline is 1-800-999-6673 (NORD).
  • Respite — time off while someone else provides care — is one of the services Medicaid home and community-based waivers can cover (Medicaid.gov).

Help paying for care

  • Medicaid waivers: states run home and community-based services (HCBS) waivers for people who would otherwise need institutional-level care. They can cover case management, personal care, habilitation and respite, and states can set aside the usual income rules. Each state chooses who its waivers serve and caps the number of places (Medicaid.gov), so ask early.
  • SSI for children: Supplemental Security Income can pay a monthly benefit to children with disabilities in families with limited income and resources; a parent’s income and resources are counted for children living at home. In most states, a child who gets SSI can also get Medicaid (Social Security Administration).
  • California families can ask their local regional center about Early Start (under age 3) and ongoing developmental services (California DDS).
  • Foundation grants: the Angelman Syndrome Foundation’s Family Support Funds offer grants of up to $2,500 for things like safety beds, communication devices, adaptive equipment, therapy co-pays and travel to an ASF clinic, plus up to $1,000 for respite. They open once a year for a short window in October (ASF).

Still being researched: Acupuncture, Massage therapy. We add each approach once its costs and results are sourced. Are you a practitioner with experience treating Angelman Syndrome? Tell us.

Member stories

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Sources

This page is for education only and is not medical advice. Costs are typical U.S. ranges and estimates; yours will depend on your provider, location and insurance. Talk with your doctor before starting, stopping or combining any treatment. In an emergency, call 911. See our disclaimer.

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