myasthenia gravis can affect breathing, ranging from mild shortness of breath to a severe, life-threatening condition called a myasthenic crisis. It causes weakness in the muscles that control breathing, including the diaphragm and chest muscles, making it difficult to inhale and exhale properly. This can lead to respiratory impairment and, in severe cases, respiratory failure. Muscle weakness: The core problem is weakness in the voluntary muscles, including the respiratory muscles. As the disease progresses, these muscles can become too weak to support proper breathing.
Shortness of breath: A common symptom is shortness of breath, which can be more noticeable with activity or fatigue.
Myasthenic crisis: This is a medical emergency caused by extreme muscle weakness, which can include the diaphragm and chest muscles. A myasthenic crisis is characterized by severe breathing difficulties that may require a ventilator to help the person breathe.
What to do
Call emergency services: If you experience severe breathing or swallowing difficulties, call 999 immediately. This could indicate a myasthenic crisis that requires urgent hospital treatment.
Seek immediate medical care: A myasthenic crisis is a medical emergency that requires immediate treatment in a hospital. Treatment may include oxygen, a ventilator, or other therapies to restore muscle strength.

MG is particularly problematic because while a symptom might be connected with MG it might also relate to independent problems or even to both. So for concerning symptoms it's important to get worked up by specialists for the organ involved: cardiologist for heart symptoms, pulmonologist for breathing problems, nephrologist for kidney problems, etc. This means spending a lot of time in doctors' offices, which many don't like. But it's always our individual choice. If you want to be sure, see the doctor. If you worry a lot, see the doctor. Otherwise, it's your call.