I frequently tweet about neurological diseases, sending out links to US government and major foundation web sites. These tweets are among the most retweeted and favorited of those I distribute.
As you may have inferred as you look at the fact sheets distributed, there are commonalities among many of these diseases above and beyond the fact that these are all diseases of the nervous system.
Very few of these diseases have treatments. Most of these diseases are rare and often not detected by primary care physicians or even related specialists like psychiatrists. Medications are frequently used off-label for controlling symptoms like depression, anger, tremor, and many others but these treatments are rarely effective for a long time, if at all, for most patients. Because these are rare diseases and neurological research itself is quite expensive, a small portion of the US medical research budget is spent looking for cures or effective symptom control.
The following mind map shows some of the commonalities among the neurological diseases. Click on the image to expand it.