Aren't they just made up things that the doctors come up with when they do not know the answer why you are having pain in certain areas? And isn't just another name for Depression? I wondered because my even though I have been diagnosed by another doctor with Chiari Malformation and I have had surgery for it, but my problem is back, the new doctor is sending me to be checked for them things. They told me that you can be depressed and not know it and without showing signs! what? I have no signs of depression and I do not feel depressed at all. I am a happy person except for hearing that and I have a good sense of humor. I am not sad at all or down in the dumps. So what the heck?