Kysphosis, commonly known as dowagers hump, is related with
osteoporosis. Its the thinning of the bones. It can be hereditary.
Weak areas compress through the back, causing pain. Though, it
could be other things, like a fatty hump, or worst comes to worst,
a toomer. You might want to get it checked. If it is a toomer, keep
in mind that toomers are cancerous, and, well, that's not very
good.
Best of health mate.