What is Neuromyelitis Optica?
Neuromyelitis optica (NMO) is a rare autoimmune condition that affects the brain, spinal cord, and optic nerves. It happens when the immune system mistakenly attacks healthy tissue in the nervous system, causing inflammation and damage.
NMO most often affects vision and movement. Some people experience sudden attacks that can lead to symptoms such as vision loss, weakness, or numbness.
Experts do not fully understand why this happens, but certain immune system antibodies are linked to the condition. While there is no cure, treatment can help manage symptoms and reduce future flare-ups.
Symptoms
Symptoms of NMO can appear suddenly and may become severe during an attack. Some people recover partially between episodes, while others may continue to have ongoing symptoms.
Common symptoms include:
- Eye pain
- Blurred vision or vision loss
- Weakness in the arms or legs
- Numbness or tingling
- Difficulty walking
- Muscle stiffness or spasms
- Loss of bladder or bowel control
- Severe nausea, vomiting, or hiccups
- Fatigue
How is it diagnosed?
Diagnosing NMO usually starts with a neurological exam and a review of symptoms. Because NMO can look similar to multiple sclerosis and other nervous system conditions, testing is important to confirm the diagnosis.
Your provider may recommend:
- MRI scans of the brain and spinal cord
- Blood tests that look for NMO-related antibodies
- Vision and nerve function testing
- Spinal fluid testing in some cases
Early diagnosis can help guide treatment and lower the risk of future nerve damage.
How is it treated?
Treatment for NMO focuses on controlling inflammation, preventing relapses, and managing symptoms. During an attack, providers often use corticosteroids to reduce swelling in the nervous system. Some people may also need plasma exchange therapy, which removes harmful antibodies from the blood.
Long-term treatment may include medications that calm the immune system and help prevent future flare-ups. Rehabilitation therapies such as physical therapy and occupational therapy can improve mobility and daily function.
Supportive care may also help with pain, fatigue, vision changes, or bladder and bowel symptoms. Because NMO is a lifelong condition, ongoing medical follow-up is important.
