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You may suspect you have multiple system atrophy if you have several symptoms that are unexplained by other causes such as: loss of balance, low blood pressure, dizziness or fainting, tremor, rigidity, loss of sweating, loss of sex drive, bladder incontinence, constipation, sleep apnea, acting out your dreams (REM behavior disorder). A movement disorder specialist neurologist or an autonomic specialist neurologist are the most expert in diagnosing this disease. General practitioners or even general neurologists likely will have never seen a case of this rare disease.