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Health condition

Myasthenia gravis guide

Myasthenia gravis is an autoimmune condition causing fatigable muscle weakness - drooping eyelids, double vision, and weakness that worsens with use - and it is very treatable.

Key points

What matters most, at a glance.

The essentials in plain English - symptoms, when to seek help, who to see and what treatment looks like.

  • Hallmark: weakness that worsens with repeated use and improves with rest, often worse by evening

  • Common first signs: drooping eyelid, double vision, difficulty chewing, slurred or nasal speech

  • Diagnosed with antibody blood tests (AChR, MuSK) and neurophysiology; a chest CT checks the thymus

  • Treatment ladder: pyridostigmine, corticosteroids, steroid-sparing agents, and newer targeted biologics

  • Thymectomy improves outcomes in selected antibody-positive patients

  • Worsening swallowing or breathing is an emergency - myasthenic crisis needs hospital care

Understanding it

About Myasthenia gravis guide, and what to do next.

In myasthenia gravis, antibodies block the signal between nerve and muscle, so muscles tire abnormally fast. Around half of people present with eye symptoms - a drooping lid or double vision that fluctuates through the day - and many progress to generalised weakness affecting speech, swallowing, neck, limbs and, in crisis, breathing. Diagnosis combines the story, examination for fatigability, antibody testing and repetitive nerve stimulation or single-fibre EMG; a CT chest is standard because thymic abnormalities, including thymoma, accompany the disease.

Modern treatment makes most people’s lives close to normal. Pyridostigmine boosts transmission symptomatically; immunosuppression - corticosteroids led in carefully titrated doses, then agents such as azathioprine or mycophenolate - addresses the disease itself, and newer complement and FcRn inhibitors are reshaping care for refractory disease. Thymectomy benefits selected patients. The essential safety knowledge: infections, some antibiotics and rapid steroid changes can precipitate deterioration, and any progressive difficulty swallowing or breathing warrants same-day emergency assessment. A neurologist with neuromuscular expertise should oversee care, and UK myasthenia charities offer excellent patient resources.

A quiet reminder

This guide is for information, not medical advice.

Your GP knows your history and can tell you which parts apply to you. If in doubt, see them.

Frequently asked

Common questions about Myasthenia gravis guide.

Quick, plain-English answers to what people ask us most.

  • What is myasthenia gravis?

    Myasthenia gravis is a chronic autoimmune condition in which antibodies block or damage the connection between nerves and muscles, causing fluctuating muscle weakness that typically worsens with activity and improves with rest.

  • What causes myasthenia gravis?

    It's caused by antibodies attacking receptors at the neuromuscular junction, most commonly acetylcholine receptors, disrupting normal signal transmission from nerve to muscle. It's often associated with abnormalities of the thymus gland.

  • What are the symptoms of myasthenia gravis?

    Common symptoms include drooping eyelids, double vision, difficulty swallowing or slurred speech, and weakness in the arms, legs or neck that characteristically worsens with repeated use and improves with rest.

  • Is myasthenia gravis dangerous?

    It can be, particularly if weakness affects the breathing or swallowing muscles severely enough to cause a myasthenic crisis, a medical emergency, though with appropriate treatment most people achieve good symptom control.

  • Can myasthenia gravis be cured?

    There's no outright cure, but the condition is very treatable, and many people achieve substantial or complete symptom control with medication, and sometimes surgical removal of the thymus gland.

  • How is myasthenia gravis treated?

    Treatment includes medications that improve nerve-to-muscle signalling, immunosuppressive drugs to reduce antibody production, and in some patients, surgical removal of the thymus gland, with plasma exchange or immunoglobulin reserved for severe flares.

  • When should I see a neurologist about possible myasthenia gravis, and how quickly can I be seen privately?

    See a neurologist promptly for fluctuating weakness that worsens with activity, particularly affecting the eyes, face or swallowing. A private neurologist can typically arrange assessment and specific antibody testing within about two weeks.