Insects naturally, in particular spiders.
But I suppose the thing, not really a phobia, but is a fear in general, is that, using an example here; I am currently experiencing pains and aches in my left shoulder, side and chest. Naturally, my first thought is that I am having a heart attack. As I am afraid I am having a heart attack, the pain seems to be worse. I am feeling the worse pain, and now I am really panicked, which means more pain, which means etc, etc etc. I literally create cycles of pain and panic for myself, over anything.
But I suppose the thing, not really a phobia, but is a fear in general, is that, using an example here; I am currently experiencing pains and aches in my left shoulder, side and chest. Naturally, my first thought is that I am having a heart attack. As I am afraid I am having a heart attack, the pain seems to be worse. I am feeling the worse pain, and now I am really panicked, which means more pain, which means etc, etc etc. I literally create cycles of pain and panic for myself, over anything.