It's genetics, 
and it's 
environment.
It's meningitis, glandular fever
and the novel coronavirus.
It's bad habits catching up 
with me. 
It's poison dust and GM foods
and leaded petrol. 
It's stress-induced.
It's karmic irony.
It's my sense of foreshortened future 
made manifest.
It's a new way of self-harming 
on a cellular level. 
It's punishment from a god
I don't believe in.
It's the universe replying it 
doesn't care.
It's
dumb
*******
luck.

There's a million different 
(equally plausible, equally irrelevant) 
reasons.
None of them change anything.