2. It Can Affect Mobility and Breathing
While it starts primarily in the eyes, the disease can become more generalized and affect muscles responsible for lifting your arms, stand up, or walk up stairs, according to WebMD.
The disease can also affect the muscles used for chewing, swallowing, and even smiling. Perhaps the worst-case scenario is that the disease can affect your ability to breathe (from weakness of the chest muscles), causing what is called a “myasthenic crisis” – which is a medical emergency.