Pushing Limits of New Knees

New Guidelines for Spotting Alzheimer's

The first update in nearly 30 years to U.S. guidelines for the diagnosis of Alzheimer's disease expands the definition to include patients with earlier stage symptoms.

A Giant Step for Heart Research

Researchers are studying what happens to astronauts' hearts in space to help patients back on Earth.

Cutting Allergy Shots

Researchers have developed a new vaccine to desensitize people with a cat allergy that is faster and safer than traditional immunotherapies.

When a Cuddly Crib Puts Baby in Danger

That adorable crib may be a health hazard. Fluffy bumpers, pillows and blankets and a menagerie of stuffed animals all pose a suffocation risk to babies less than 12 months old.

• Video: Decorated Cribs a No-No | Audio

A Good Night's Sleep by a Nose

Snoring and waking up at night are common nighttime annoyances, but for many, they are signs of a major health problem: sleep apnea. A number of companies are marketing nasal devices to treat the disorder.

Off-Label Use of Clot Drug Is Faulted

The use of a drug for the rare blood disorder hemophilia has soared in hospitals in the U.S. in the last decade, but nearly all of the growth has come from treatment of medical conditions for which the medicine has little proven benefit, researchers said.

• Off-Label Uses Draw Scrutiny

Leukemia Drug Shortage May Get Relief

An Illinois drug maker plans next week to resume shipments of a key leukemia drug, helping to alleviate a life-threatening shortage of the drug, although it won't immediately fix the problem.

Board Forces Doctor to Seek Approval on Surgeries

The Oregon Medical Board forced a neurosurgeon who performed multiple spinal fusions on the same patients to seek prior approval before doing any more surgeries, in a temporary step pending a full investigation.

Shortage of Leukemia Drug Worsens

A shortage of a key leukemia drug that started last year has worsened, causing many major cancer centers such as the Johns Hopkins Hospital to start rationing the drug and others to turn away patients from community hospitals that have run out of the medication.

MS Study Questions Blocked-Vein Theory

A new multiple-sclerosis study questions a theory about a potential cause for the autoimmune disease that had been embraced by patients around the world, who had turned to risky surgeries to unblock neck veins when drug treatments didn't work for them.

Hospital Bars Surgeon From Operating Room

A Portland, Ore., neurosurgeon who performed multiple spinal fusions on the same patients lost his operating privileges at the hospital where he did many of his surgeries and is under investigation by the Oregon Medical Board.

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Scientists Unveil Atlas of the Brain

The online atlas documents the interplay between brain structure and biochemistry, charting genes at work throughout the human brain.

• Video: Scientists Unveil Digital Atlas of the Human Brain

Get Moving to Ease Joint Pain

As more young people are diagnosed with osteoarthritis, doctors are recommending physical activity to help joints over traditional advice to take it easy.

How Old Viruses May Haunt Us

Recent studies suggest ancient viruses, which litter the human genome but were believed to lie dormant, may play a role in modern diseases like Hodgkin's lymphoma and multiple sclerosis.