The book, When the Body Says no is about how “stress” influences chronic illness. Now, stress encompasses a lot of things here, which is why I put it in quotations. It includes life stress, attachment, coping styles, trauma, adverse early childhood experiences, adult relationships, and so on.
The good thing is, that even people with chronic illness can develop resilience. Warning: it does require work on your part. Luckily, some of the work may not feel like work at all… it just requires consistent commitment to it.
My mom actually suggested I do a post on mental strength and I thought about it for a bit because