SymptomsSome of the symptoms of myasthenia gravis include:
- Weak muscles
- Weakness that improves after resting and gets worse after physical activity
- Visual disturbances such as double vision, inability to hold a steady gaze and droopy eyelids
- Difficulty chewing and swallowing
- Breathing difficulties
- Shortness of breath
- Problems walking
- Slurred speech
CausesMyasthenia gravis is caused by a problem with the transmission of nerve signals to the muscles. It is an autoimmune condition, which means the bodys immune system attacks its own tissues.
The exact cause of myasthenia gravis is unknown. In some cases, it is linked to tumors of the thymus (an organ of the immune system).