Hello, I have swollen muscles in my lower and mid back, it kind of bulges out more on the left side. I also get this icy and hot burning sensation under my ribs that will last for days, then sometimes switch sides. Could I Have some sort of back problem? Also, could a kidney stone cause my back to bulge out like this? urine and blood test for kidney infection was negative. All blood tests for liver, etc normal.

Arm and leg bones develop from which embryonic germ layer?
The liver develops from which embryonic germ layer?

During embryo development, the process in which one group of cells that can influence neighboring cells by chemical signals that switch on genes is called ______________.

Thank you very much!

I have recently started drinking alot more water after a long period of not having drank as much as I should have. I go through this evey few months or so. After a few days of drinking water, I begin to feel pain in my right side, underneath my ribcage, more towards the back. I don’t know if it’s one of my kidneys or my liver or what. The pain can be pretty strong; it usually happens after I’ve consumed quite a bit of water (nothing too extreme, though), and sometimes lasts the better part of a day. Is it just one of my organs detoxing?