What types of support groups are there?
There are many types, ranging from local community groups meeting over coffee and donuts to virtual communities spanning the globe. Many can refer you to specialists or local support meetings. Others may provide links to research results or even studies in progress. Finding them may be the biggest difficulty.
Organizations focusing on research of a particular illness will often have links to relevant support groups. Even if they don't, they'll often have information that may help you ( or an aquaintance ) understand an illness better.
Support groups for generalized pain or chronic pain can help, without being specific for a cause of pain. Often, meeting other people who are dealing with pain can be of help.
The Navigation bar to the left can direct you to specific support organizations on the web.