Your doctor may have been using the term myopathy in the more general sense, i.e., to name the condition of your muscles, perhaps as a result of or in association with your essential tremors and Parkinson's disease, or the treatment for these conditions. It destroys the cells in that part of the brain where one of the chemicals needed for transmitting impulses between nerve cells is produced. Usually the cause is unknown. The symptoms of parkinsonism relate to the nervous system's decreased ability to control voluntary muscle movement. The four cardinal signs of parkinsonism are resting tremor, stiffness, slowness of movement, and instability of balance and posture.
Essential tremors are different.
Essential tremors are the most prevalent of these tremors. The cause of essential tremors is also not known, but the disorder may be inherited. Likewise, treatment, when possible, is different. Botox is a relatively new alternative treatment for controlling the sending of abnormal electrical impulses from the nervous system. Botox is the brand name for Botulinum toxin type A, a potent nerve poison.