|Usual onset||Women under 40, men over 60 |
|Duration||Long term |
||Blood tests for specific
|Frequency||50 to 200 per million  |
Myasthenia gravis (MG) is a long-term
Myasthenia gravis is an
Myasthenia gravis is generally treated with medications known as
MG affects 50 to 200 per million people.
 It is newly diagnosed in three to 30 per million people each year.
 Diagnosis is becoming more common due to increased awareness.
 It most commonly occurs in women under the age of 40 and in men over the age of 60.
 It is uncommon in children.
 With treatment, most of those affected lead relatively normal lives and have a normal
The initial, main symptom in MG is painless weakness of specific muscles, not fatigue.  The muscle weakness becomes progressively worse during periods of physical activity and improves after periods of rest. Typically, the weakness and fatigue are worse toward the end of the day.  MG generally starts with ocular (eye) weakness; it might then progress to a more severe generalized form, characterized by weakness in the extremities or in muscles that govern basic life functions. 
In about two-thirds of individuals, the initial symptom of MG is related to the muscles around the eye.
 There may be eyelid drooping (
The weakness of the muscles involved in swallowing may lead to swallowing difficulty (
Weakness of the muscles involved in speaking may lead to
Due to weakness of the