Hi, In the given bit of data you have said you have muscle fatigue with myalgia and weakness. Now, first and foremost, this may be myasthenia - the weakness should occur after a work has been started and not throughout and myalgia usually does not affect myasthenic patients. Fatigue can affect you in both myasthenia and muscle disorders. I would therefore seriously consider muscle diseases as a possibility and suggest testing CPK. Now, these symptoms are not a part of Lewy Body Dementia, and you have not reported any other symptom. So from the message per se, I am not sure why this possibility is being considered. But I am assuming your examination must have yielded findings that has lead your neurologist to consider this possibility. Now to answer your specific question - Is it possible to have MG and LBD together? Yes, they can occur together- not necessarily in relation to each other. But literature suggests that it is possible for a person to have both the conditions. I would request you to let me know about your problems in details, rather than just listing the diagnosis that were considered in your case. Once I know all details, I can probably help you better. Hope I have answered your query. Let me know if I can assist you further. Regards, Dr. Saumya Mittal , Diabetologist