If you mean muscle weakness, some of the other causes are motor neuron disease ( like ALS), hypothyroidism, certain demyelinating conditions, inflammatory neuropathy, diabetic neuropathy and vitamin deficiencies.
There are certain other conditions where the muscles are actually not weak, but one feels as if they are. This is fatigue. The common causes are chronic fatigue syndrome, depressive disorders and anemia.
Would you like to share any more symptoms you might be having ?
Could you find out the diagnosis that you needed ? There are good tests available for testing muscle fatigue and weakness. For example, the tensilon test is done for checking if the muscle fatigue and weakness is due to MG. An electromyography is also useful to ascertain if the weakness / fatigue is in the muscle or in the nerve.
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