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Chris Wragge speaks with Dr. Jennifer Ashton about the causes of tension headaches and how to combat them.

Chris Wragge talks to "Early Show" medical correspondent Dr. Jennifer Ashton about the big changes in store for child seats.

Dr. Jennifer Ashton explains the dangerous risks of a legal, designer drug, 2C-E that lead to one death and 10 hospitalized in Minn.

Erica Hill is one month into her fitness quest and is focusing on diversifying her diet and keeping workouts consistent. She also speaks with Dr.

Erica Hill speaks with Dr. Jennifer Ashton about the dangers of the legal hallucinogenic designer drug "2-C-E."

Chris Wragge talks to nuclear energy expert Cham Dallas and Dr. Jennifer Ashton about radiation fears spreading to the U.S

Chris Wragge talks to Dr. Jennifer Ashton about radiation exposure and the symptoms of radiation sickness

Medical Correspondent Dr.

Japan's earthquake and tsunami put the nation at the brink of a healthcare disaster. Dr.

Dr. Jennifer Ashton spoke with Erica Hill on who is most at risk of radiation exposure after Japan's Fukushima Dai-ichi nuclear power station experienced a partial meltdown.

Dr. Jennifer Ashton on varying degrees of danger people in Japan face, what could happen and how soon

Chris Wragge speaks with Dr. Jennifer Ashton about new 3D mammograms that allow doctors to more accurately detect cancer.

A Boston woman became the first in the U.S. to receive a 3D mammogram outside of a clinical trial. Dr.

Chris Wragge talks to Dr. Jennifer Ashton about the recent sudden deaths of two high school athletes due to heart problems.

CBS News Medical Correspondent Dr. Jennifer Ashton explains how heart ailments can strike -- no matter how young or healthy a person is