"A stress fracture is a break in a bone caused by repetitive stress…There is often no recollection of injury. The patient may simply develop a pain after some activity…Without proper treatment, this may progress to a 'through and through' (overt) fracture of the bone."
In other words, it may just break. All that stress and the pain that's built up may cause the body to snap break bam like that. I think I have stress fractures all over my body. I think I have a stress fracture in my skull because there's been this pain on the side of my temple for months now, but I don't remember banging my head in any way. I think I have stress fractures in my ribs, because it hurts to breathe. I think I have stress fractures in my wrists, because they ache whether I use my keyboard and mouse for hours on end or I don't. I'm certain there must be a giant stress fracture in the lower part of my spine, because there's no other explanation for the shooting pain I feel when I lean over to pick up a sock on the floor. And worst of all, I think I have a stress fracture in my heart, because it just feels so sore and achy all the time.