# Severe myasthenia gravis
What is it
Myasthenia gravis (MG) is a rare autoimmune disease in which the body produces antibodies against proteins that are necessary for communication between nerves and muscles. This damaged communication leads to muscle weakness that can range from mild to severe. The word 'myasthenia' literally means 'muscle weakness'.
In severe myasthenia gravis, multiple muscle groups are affected — often both the eyes, face and jaw muscles as well as the muscles of the arms, legs and trunk. In the most severe form, breathing and swallowing muscles can also be involved, which may require emergency medical intervention.
The disease develops because the immune system malfunctions and attacks the place where nerve and muscle meet (the neuromuscular junction). This usually happens without a clear external cause, although research indicates that some people have genetic susceptibility and that certain autoimmune diseases can precede the diagnosis.
Causes
The precise cause of myasthenia gravis is not fully understood, but it is clear that a combination of genetic and environmental factors plays a role. The immune system attacks the neuromuscular junction — usually by producing antibodies against certain proteins, especially against the acetylcholine receptor (AChR) or against MuSK (muscle-specific kinase).
In approximately 10-15% of patients with myasthenia gravis, a thymoma (a tumor of the thymus, an immune organ) precedes or develops during the disease. Research also shows that some people can have multiple autoimmune diseases, and that other autoimmune conditions sometimes occur years before myasthenia gravis.
Many patients have no clear trigger. The disease can begin at any time in life, although there are two peak ages: around 20-30 years and around 50-60 years.
How the disease progresses
Myasthenia gravis progresses very individually. Some people have a mild form that remains relatively stable for years; others experience a progressive course with increasing weakness. The disease can go through periods — periods with more or fewer symptoms.
The first months to years after diagnosis are crucial for many patients: this is a period in which how severe the disease will be and which muscles are most affected becomes apparent. Most patients receive more intensive treatment at this stage to control the disease.
In severe forms, the disease can suddenly worsen in so-called 'myasthenic crisis' — a state of acute, severe muscle weakness that can develop rapidly, especially due to infections, stress, certain medications or not following treatment properly. This requires immediate medical attention, sometimes with ventilatory support.
Although myasthenia gravis is incurable, many patients can achieve good control through treatment. The disease does not limit itself to one phase but can remain stable for years or change slowly.
Symptoms by phase
**In the initial period** symptoms may advance or recede without a clear pattern. Many people first notice:
- Fatigue in specific muscles after exertion (typically drooping eyelid, double vision or difficulty speaking after talking)
- Symptoms that are less in the morning and worsen during the day
- Weakness in face, jaw, neck or limbs
**In the stabilization phase** (first months to years) it becomes clearer which muscles are involved and how severe. In severe forms:
- Considerable muscle weakness in arms and legs, making it difficult to perform daily tasks
- Problems with speaking, swallowing and chewing
- Possible breathing restrictions due to weakness of the respiratory muscles
- Fatigue increases during the day
**During a crisis** (rare, but serious):
- Sudden, severe worsening of all symptoms
- Shortness of breath due to weakening of the respiratory muscles
- Difficulty swallowing and possible risk of aspiration
Between crises, the weakness may decrease again, though not always to the previous level.
What it means for daily life
Severe myasthenia gravis can have a significant impact on daily life, although this largely depends on how well the disease is controlled.
**Work and school:** Many patients struggle with work that requires sustained concentration or physical effort. Fatigue can be a bigger problem than direct weakness. Flexibility in working hours and rest periods helps. Some patients need to adjust their work or stop working.
**Household and personal care:** Tasks like cleaning, washing and dressing can become more difficult. Patients often learn ways to manage their energy better and ask for help when needed.
**Social activities:** Many patients notice that symptoms worsen as they get tired. This may mean that long social activities need to be planned more carefully, with rest breaks.
**Eating and drinking:** If the chewing and swallowing muscles are affected, certain foods may become difficult. Some patients need nutritional advice or adjustments.
**Medicines and treatment:** Most patients need to take daily medications and have regular medical appointments. Certain medications can have side effects that affect daily life.
**Psychological:** The process of adapting to a chronic, incurable disease can be emotionally taxing, especially at first.
However, many patients with good medication management can lead a reasonably normal life, albeit with adjustments.
Outlook
The outlook for myasthenia gravis has become much more favourable than it was decades ago. Recent data shows that patients with myasthenia gravis have a longer life expectancy than was thought for a long time — in many cases comparable to the general population.
**Survival rates:** Population studies from 2025-2026 show that many patients survive well with adequate treatment. Most deaths are not directly due to myasthenia gravis itself, but to other causes or complications (such as infections in very severe forms). This says nothing about your personal outlook — this depends on how your disease responds to treatment.
**Recovery:** Complete recovery is very rare, but long-term remissions (periods without noticeable symptoms) are achieved by many patients. Some may be able to reduce or stop medications later — but this must always be done under medical supervision.
**Treatment advances:** New treatment options (especially biological medicines) have become available in recent years that work better for some patients or have fewer side effects. This gives more patients prospects for better control.
**Thymoma link:** For patients with a thymoma, removing it (thymectomy) can positively influence the course of myasthenia gravis, although this varies greatly from individual to individual.
The key to a better course is usually early diagnosis, good medical care and regular monitoring.
Frequently asked questions
**Is myasthenia gravis hereditary?**
Myasthenia gravis itself is not hereditary in the classical sense — you cannot inherit it directly from your parents. However, certain genetic susceptibility and hereditary factors can play a role. Family members do not have an increased risk of the disease, but if someone in your family has myasthenia gravis, this may indicate a genetic component. However, this is not a guarantee that you will develop it.
**Can I get COVID-19 if I have myasthenia gravis?**
Yes, you can get COVID-19 like anyone else. Research shows that some patients with myasthenia gravis (especially those with certain auto-antibodies) may have a higher risk of more serious lung complications. This makes precautions (such as vaccination) extra important. Always discuss this with your doctor.
**Can myasthenia gravis suddenly disappear?**
Complete spontaneous remission (without treatment) is very rare — less than 5% of patients. With good treatment, however, many patients reach a situation where symptoms can be absent for years or very mild. This doesn't mean the disease is gone, but that it is well controlled. A relapse can always happen.
**What is the difference between myasthenia gravis and MuSK-myasthenia?**
MuSK-myasthenia is a variant of myasthenia gravis where the immune system attacks a different protein (MuSK) than in classic myasthenia gravis (AChR). This sometimes leads to slightly different symptoms and can respond differently to certain treatments. Both are forms of the same disease.
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_This information never replaces a doctor's judgment. Always discuss your situation with your own healthcare provider._