What is Myasthenia Gravis?
Myasthenia gravis (MG) is a long-term autoimmune condition that causes muscle weakness. It happens when the immune system interrupts the signals sent between nerves and muscles, making it harder for muscles to work normally.
The exact reason this happens is not fully understood. In some people, the thymus gland may play a role in triggering the immune response. Symptoms can become worse during illness, stress, lack of sleep, or after taking certain medications.
MG most often affects muscles that control the eyes, face, throat, arms, and legs. Symptoms can come and go and may become worse after activity.
Symptoms
Myasthenia gravis affects people differently, but muscle weakness is the main symptom. Weakness often improves with rest and becomes more noticeable later in the day or after repeated movement.
Common symptoms include:
- Drooping eyelids
- Double vision
- Trouble speaking clearly
- Difficulty chewing or swallowing
- Weakness in the arms, legs, or neck
- Facial weakness
- Fatigue during activity
- Shortness of breath in severe cases
How Is It Diagnosed?
Healthcare providers diagnose myasthenia gravis using a combination of symptoms, physical examination, and specialized testing. Your provider may look for patterns of muscle weakness that change with activity and rest.
Testing may include:
- Blood tests to check for MG-related antibodies
- Electromyography (EMG) and nerve conduction studies
- Imaging tests to evaluate the thymus gland
- Breathing tests if respiratory muscles are affected
Early diagnosis can help reduce complications and improve symptom control.
How Is It Treated?
Although there is no cure for myasthenia gravis, many people can manage symptoms successfully with treatment. Care usually begins with medications that improve communication between nerves and muscles or reduce immune system activity.
Treatment options may include:
- Medications that improve muscle strength
- Steroids or other immunosuppressive medicines
- Intravenous immunoglobulin (IVIG)
- Plasmapheresis to remove harmful antibodies from the blood
- Surgery to remove the thymus gland in some patients
Lifestyle changes can also help manage symptoms. Getting enough rest, avoiding illness, and balancing activity with recovery may reduce flare-ups.
In severe cases, MG can lead to a medical emergency called myasthenic crisis, which affects breathing muscles and requires immediate care.
