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4 Your Health: more arthritis cases than thought; pros, cons of tap water; bullied teens get armed

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Teenagers bullied in school may be more likely to bring a weapon to class.

A new study, published in the Journal Pediatrics, finds bullying victims are much more likely to carry a gun or knife than other students. The risk rose, even more, when kids got into fights at school, felt threatened, or skipped school because they were too afraid for their safety.

Experts suggest watching for red flags like unexplained bruising and missing a lot of school.

Tap water and children

New research reveals the potential benefits and risks to children and teens who drink tap water.

A University Of North Carolina study found children who drank tap water were much more likely to have elevated levels of lead in their blood. But kids who did not drink tap water, which usually contains fluoride, had a higher risk of tooth decay.

More suffering from arthritis

Arthritis is much more common among Americans than previously thought.

Researchers at Boston University said current estimates are only based on doctor-diagnosed arthritis. But when they included patients with chronic joint pain, estimates were 68 percent higher.

The prevalence of arthritis was especially underestimated among people younger than 65.

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