Myasthenia gravis
Myasthenia gravis is a rare long-term condition that causes certain muscles in the body to become weak.
Muscle weakness is the main symptom of myasthenia gravis. The eye and facial muscles and those that control swallowing are commonly affected.
Myasthenia gravis is caused by a problem with the transmission of nerve signals to the muscles.
Confirming a diagnosis of myasthenia gravis can take a long time because the condition is rare and muscle weakness is a symptom of many different conditions.
There is no cure for myasthenia gravis, but treatments are available to help control the symptoms.