Triggered by a person's abnormal immune system or an infection, nephritis occurs when the kidney's filters become inflamed, scarred and destroyed.

CNN: STORY HIGHLIGHTS

The ulnar nerve, which travels through the forearm and branches into the hand, can become weakened and scarred after being stretched repeatedly.

CNN: More talking, more problems: 'Cell phone elbow' damages nerves

After years of high unemployment and scarred from rounds of company cost-cutting and layoffs, managers say their workers seem to have become allergic to risk.

WSJ: Memo to Staff: Take More Risks