So in a small minority of people, there is a “mismatch” between their mind (I’m going to ignore reference to a ‘soul’ since there is no objective evidence such a thing exists) and their body. This mismatch causes discomfort, distress, a desire to change the body to match the mind’s image of how it should be and, if this change is prevented, we’re led to believe the distress can cause suicidal ideation.
Since disabled people have been dragged into this as a point, I'll add here:
I don't believe I'm in the 'wrong' body and someone put me in a disintegrating one because of some mistake, and someone else should have been in this one. If you believe in some divine force placing separate and eternal souls in bodies then ok, but if they're divine how are they making these mistakes?
I have a grotty body. I fight with it every day. I get frustrated and angry with it, in my head I am able bodied and there is a constant clash between what I want to do and the reality of what my body does, but my mental health depends on coping with it and accepting it and working with it rather than rejecting it. My hcps and support community all focus on the mental health need of acceptance and understanding and finding peace within that, because otherwise, yes, suicidal ideation is not uncommon.
If someone could offer me surgery tomorrow that would give me an entirely 'normal' body that functioned in a healthy way? Yes of course I'd want it. If someone could offer me surgery that would merely make me 'look' like other people and present a facsimile but had endless side effects? Well now it's getting complicated, isn't it?
And many disabled people have fought for years against 'normalising' surgery that merely help them to look and be positioned like everyone else, because they are who they are and there should not be a 'norm' that they are compelled to get to rather than being able to accept themselves and be accepted in the way that they are. Like homosexual people for decades: we are proud of our history and differences, and ask for equality of opportunity and access.
I certainly don't expect people to change all their language based around their capacity to walk, for example. Or to expect that they don't walk in front of me and all use wheelchairs because it's distressing to me that they can walk and I can't, and to be confronted with 'cis' able bodied people when I'm identifying as able bodied from a wheelchair. I don't expect people to be entirely focused on me at all times and to centre me in every situation, and I'm capable of coping with charities and activities and groups that work for example with Autism or cancer or heart disease, without feeling immediately threatened and wanting to shut them down because they're not including me.
But this is what the TQ+ political position is.