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From Rev Left's description of his own OCD, the foundational pillar of OCD is anxiety. All the compulsions revolve around anxiety.
I’m obviously anxious. OCD fits my anxiety more than any other description. Fuck, why do I do this. In one mood it’s obvious I have OCD, then I doubt it a lot. Then the cycle begins again. My initial questioning was due to Breht’s testimony hitting home.
I'd push back on this a bit, OCD is no longer categorized as an anxiety disorder but it's own thing in the DSM-V. Anxiety is a huge component of it to be sure, but a lot of OCD (especially the types of OCD that are centered around taboo thoughts, which is what I mostly have) also spirals around other feelings such as guilt, shame, disgust, or self-hatred. The primary feeling that drives me to do compulsions in response to intrusive thoughts is a mix of all of these, and I don't even know if I would put anxiety at the forefront of it. That being said in the past when I was a kid with OCD I remember anxiety being a larger component of my experience with it, so I know that's a common experience. I have severe OCD but I also have a completely separate anxiety disorder, and these two things are very distinct experiences for me (though I don't doubt that for other people with the two that distinction may not be as clear.)