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A lumbar strain is an injury to the lower back. This results in damaged tendons and muscles that spasm and feel sore.

Detailed information on the most common types of screening tests for common diseases.

Detailed information on a child's vision milestones.

A head injury is a broad term that describes many injuries that occur to the scalp, skull, brain, and underlying tissue and blood vessels in the head. Head injuries are also commonly referred to as brain injury, or traumatic brain injury, depending on the extent of the head trauma.

Detailed information on firearm safety and prevention.

A bone density test measures the strength and density of your bones as you approach menopause and, when the test is repeated sometime later, can help determine how quickly you are losing bone mass and density.

Sometimes called antiangiogenic therapy, this treatment may prevent the growth of cancer by blocking the formation of new blood vessels.

A clinical trial is a research study that's done to test a new type of prevention or treatment. Being part of a clinical trial means you may benefit from a treatment that is not yet available to anyone else.

Herbal supplements are pills, powders, teas, and other products that use herbs as the main ingredient to promote health.