Your spinal cord is a bundle of nerves that runs down the middle of your back. It carries signals back and forth between your body and your brain. It is protected by your vertebrae, which are the bone disks that make up your spine.

Immunodeficiency disorders occur when the body’s immune response is reduced or absent.

When you’re short of breath, it’s hard or uncomfortable for you to take in the oxygen your body needs. You may feel as if you’re not getting enough air. Sometimes mild breathing problems are from a stuffy nose or hard exercise. But shortness of breath can also be a sign of a serious disease.

Endometriosis is a problem affecting a woman’s uterus – the place where a baby grows when she’s pregnant.

Coughing is a reflex that keeps your throat and airways clear. Although it can be annoying, coughing helps your body heal or protect itself. Coughs can be either acute or chronic.