Ever wonder why your teeth chatter when you're cold, or if it really is possible to catch a disease from sitting on the toilet?

A New York physician is laying many of these questions to rest with his new book, "Why do Men Have Nipples?"

The Chinese Health Ministry says the number of people infected with a pig-born disease in the southwestern chinese province of Sichuan has risen to 181, after seven more cases are reported.

The death toll remains at 34

British researchers reveal the latest development in AIDS treatment Friday - "drug cocktails."

Cocktails of anti-AIDS drugs reportedly cut the rate of progression from HIV infection to full-blown AIDS by 86-percent

Federal health officials report nearly 81-percent of the nation's toddlers are vaccinated on time, a record level that comes five years ahead of government expectations.

Dr. Stephen Cochi, acting vaccine chief at the Centers for Disease Control and Prevention, says the numbers are a testament to the fact parents are recognizing the benefits and importance of vaccinations

Echinacea does not strengthen the immune system, nor does it help fight the common cold, according to a new study by the University of Virigina School of Medicine.

The herbal remedy turns out to be no more effective than a placebo, said the study, which is published in Thursday's "Journal of Medicine"