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Dr. Jonathan Chan

Dr. Jonathan Chan is on ABC News. Get Dr. Jonathan Chan's latest news stories and articles, connect with millions of users and join the conversation at ABC News.

Dr. Latest Work

PHOTO: A woman receives an examination from her doctor in this stock photo.
STOCK/Getty Images

New genes discovered that may increase risk for triple-negative breast cancer

PHOTO: This image provided by Bayer Healthcare Pharmaceuticals shows the birth control implant Essure.
Bayer Healthcare Pharmaceuticals/AP

Bayer to no longer sell permanent birth control implant Essure

PHOTO: A father holds his baby in an undated stock photo.
STOCK/Getty Images

Study finds new dads may suffer from depression almost as much as new moms

PHOTO: Amoxicillin antibiotic pill is seen in this undated stock photo.
STOCK PHOTO/Getty Images

Antibiotics are overprescribed: Here's why that's not good, and what you need to know

PHOTO: A woman is seen here breast feeding in this undated stock photo.
STOCK PHOTO/Getty Images

What to know about infant feeding guidelines, as the US opposes world breastfeeding resolution

PHOTO: A store worker affixes price tags to vitamins at a grocery storey on July 26, 2017, in Denver.
Denver Post via Getty Images

Use of so-called 'alternative' supplements doubled in teens between 2003 and 2014: Study

PHOTO: Vitamin D capsules appear in this undated stock photo.
STOCK PHOTO/Getty Images

Vitamin D: Good for bones, and possibly the colon

PHOTO: Runners just after the start of the Baikal Ice Marathon on Lake Baikal, the deepest lake in the world.

Is running more than 100 miles good for your heart?

PHOTO: A person holds an Adderall pill in Puerto Rico, July 5, 2017.
GDA via AP

Dramatic rise in ADHD medication mishaps among kids, report finds

PHOTO: A family watch television together in this undated stock photo.
STOCK PHOTO/Getty Images

Researchers suggest new movie rating to help give parents guidance on violent movies