I have been looking into whether ‘neurological damage’ can actually cause the same symptoms presented on this forum. I began by looking for what can cause anhedonia.
The things that I think cause anhedonia are;
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Endocrine problem (testosterone!)
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Severe depression
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Schizophrenia (thought to be linked to a dopaminergic pathway problem)
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Disruption of dopamine in the brain - use of antidopaminergic agents or physical damage (lobotomy etc)
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Illness (Sickness behaviour)
It is actually this 5th reason that is important here (see; en.wikipedia.org/wiki/Sickness_behavior)
Behavioral aspects of experimental autoimmune encephalomyelitis (see; ncbi.nlm.nih.gov/pubmed/10683512)
Further evidence for the depressive effects of cytokines: anhedonia and neurochemical changes ncbi.nlm.nih.gov/pubmed/12401468
Anhedonic and anxiogenic effects of cytokine exposure. ncbi.nlm.nih.gov/pubmed/10442175
Effects of cytokines and infections on brain neurochemistry ncbi.nlm.nih.gov/pubmed/18079991
Cytokine dysregulation, inflammation and well-being. ncbi.nlm.nih.gov/pubmed/16166805
A meta-analysis of cytokines in major depression ncbi.nlm.nih.gov/pubmed/20015486
So this behaviour is mediated by Cytokines acting upon the brain - or within the CNS itself. Cytokines are secreted by the nervous and immune system during inflammation. Finasteride can induce hypersensitivity reactions (see; en.wikipedia.org/wiki/Hypersensitivity).
The problem is if encephalomyelitis was our problem (CNS inflammation) it should also cause other, additional symptoms. There is a less severe variant known as chronic brain inflammation/neuroinflammation which is linked to alzheimers but also now some forms of severe depression (see; sciencedaily.com/releases/2010/10/101020091857.htm) so such a thing could possibly be existing within us.
Cytokines are perhaps even more of relevance in that they can also cause peripheral neuropathy - which can of course cause ED, numb penis and anorgasmia (see; ncbi.nlm.nih.gov/pubmed/9773044). Prof Traish has stated nerve damage is causing our ED. Of course trying to link this all together would mean degeneration only on a local level - where Finasteride has acted on 5aR (or the body is now recognises 5aR as foreign!). That perhaps stretches things a bit.
So Cytokines are also something that can cause the symptoms. Something else worth checking. I am now out of ideas.