Chronic Fatigue Syndrome: Causes, Symptoms, and Treatment
Medically reviewed by Achuta Uppu, MD, Internal Medicine. Last reviewed: October 23, 2026.
What kind of doctor treats Chronic Fatigue Syndrome?
A primary care doctor, such as a family doctor or internist, usually starts the evaluation for chronic fatigue syndrome. Your doctor may also send you to a specialist to check for other conditions that cause similar symptoms. There is no specific test for it. 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 chronic fatigue syndrome?
Chronic fatigue syndrome is also called myalgic encephalomyelitis/chronic fatigue syndrome, or ME/CFS. It is a serious, long-term illness that affects many body systems. It can often make you unable to do your usual activities. Sometimes you may not even be able to get out of bed.
People with ME/CFS may not look sick, but they cannot do their normal activities. About 1 in 4 people with ME/CFS are confined to bed at some point in their illness. There is no known cause or cure.
Symptoms
ME/CFS has three main, or core, symptoms:
- Severe fatigue that lasts six months or longer and is not improved by rest, along with not being able to do activities you used to do.
- Post-exertional malaise (PEM), which means your symptoms get worse after any physical or mental activity.
- Sleep problems.
To be diagnosed, you also need one or both of these symptoms. One is problems with thinking and memory, sometimes called brain fog. The other is orthostatic intolerance, which means symptoms get worse while standing or sitting upright. You may feel lightheaded, dizzy, weak, or faint.
Other symptoms can include muscle pain, joint pain, and headaches. Some people have a sore throat or tender lymph nodes, which are glands in the neck or armpits. Others have digestive problems or sensitivity to foods, odors, chemicals, light, or noise. Symptoms can come and go and may change over time.
Causes and who gets it
Researchers do not yet know what causes ME/CFS. There may be more than one cause. Researchers are studying infections, immune system changes, physical or emotional stress, changes in how cells get energy, and genetics.
About 1 out of 10 people who get certain infections, such as the Epstein-Barr virus, go on to develop ME/CFS. Researchers are also looking at a possible link with long COVID.
Anyone can get ME/CFS, but it is most common in people between 40 and 60 years old. Adult women are more likely to develop it than adult men. Among children, teens are more affected than younger kids.
How doctors diagnose it
ME/CFS can be hard to diagnose. There is no specific test, and other illnesses can cause similar symptoms. Your provider has to rule out other diseases first.
Your provider will do a thorough medical exam. This includes questions about your medical history, your family's medical history, and your symptoms. Your provider may order blood, urine, or other tests to check for other illnesses.
Treatment
There is no cure or approved treatment for ME/CFS. But you may be able to treat or manage some symptoms. You, your family, and your provider should decide which symptom causes you the most problems and treat that first.
For example, if sleep problems bother you most, you might first try good sleep habits. If those do not help, you may need medicines or a sleep specialist. Learning new ways to manage activity can also help. Try to avoid a "push and crash." This happens when you feel better, do too much, and then get worse again.
Counseling, a healthy diet, and complementary therapies such as meditation, gentle massage, or relaxation therapy may also help. Some medicines can cause reactions or side effects that are worse than the original symptoms of the disease. Talk to your provider before you try any new treatment. Some treatments promoted as cures are unproven, often costly, and could be dangerous.
When to see a doctor
Contact your provider if you have severe fatigue, with or without other symptoms of this disorder. Other more serious disorders can cause similar symptoms and should be ruled out.
Depression can be a complication of ME/CFS. If you are thinking about harming yourself, call or text 988 (the Suicide and Crisis Lifeline) right away.
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 doctor like this can take a careful history, order tests to rule out other causes, and help you build a plan around your most bothersome symptom. They can also refer you to a specialist when needed.
Common questions
Is there a test for chronic fatigue syndrome?
No. There is no specific test for ME/CFS, and other illnesses can cause similar symptoms. Your provider diagnoses it by ruling out other diseases and looking at your symptoms.
Can chronic fatigue syndrome be cured?
No. There is no cure or approved treatment for ME/CFS. Some symptoms can be treated or managed, and your provider can help you make a plan.
Do people recover from chronic fatigue syndrome?
Sometimes. Some people completely recover after 6 months to a year. Others never feel like they did before they got ME/CFS.
What is post-exertional malaise?
It is when your symptoms get worse after any physical or mental activity. It is also called a crash, relapse, or collapse. There is no way to predict what will cause a crash or how long recovery will take.
Sources
- MedlinePlus - Myalgic Encephalomyelitis/Chronic Fatigue Syndrome
- CDC - ME/CFS Basics
- MedlinePlus - Myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS)
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.
