Myasthenia is characterized by what symptom?

Myasthenia gravis is an autoimmune neuromuscular disorder that primarily affects the communication between nerves and muscles. The hallmark symptom of this condition is muscle weakness. This weakness typically worsens after periods of activity and improves after periods of rest. It can affect various muscle groups, leading to difficulties in movement, speech, swallowing, and even breathing in more severe cases.

While severe headaches, joint swelling, and shortness of breath can be associated with other medical conditions, they are not characteristic of myasthenia gravis. The disorder specifically targets the muscle systems, manifesting primarily through muscle weakness, which makes it distinct among other symptoms associated with different diseases.