Americans might get a flu vaccine to avoid getting sick, but they might not consider the large scale outcome of this decision — the millions of flu cases across the country avoided through vaccination.

Since toddlers' high chairs are higher than regular chairs and are often used in kitchen and dining areas where the floors are hard, falls from a high chair are more apt to cause injury. Learning about such falls could help prevent them.

Natalizumab (Tysabri) can decrease the disease activity and slow the disabling effects of relapsing-remitting multiple sclerosis, but smoking may change that.

A medication that treats a type of leukemia targets a protein that’s involved in the spread of breast cancer. Combining this medication with a standard breast cancer therapy helped some patients live longer.

Aromatase inhibitors (AI) are medications that block production of estrogen, the hormone that feeds most breast cancers.

Venous thromboembolism (VTE) is rare in children, which often causes it to be overlooked, leading to delays in treatment that can sometimes be deadly.

Serious blows to the head that affect the brain's ability to work are among the risks of contact sports. And concussions aren't the only injuries that can affect brain function.

Many women lose control of their bladder after pregnancy. This can not only be embarassing, but treatment can be expensive and the condition can seriously affect a woman's overall quality of life.

Breast cancer in older women behaves differently than it does in younger women. Breast cancer is less likely to return in older women. So older women can be treated differently, too, a new study suggests.

What age should breast cancer screening start? How often should it be performed? How many women have to be screened to prevent one breast cancer death? Breast cancer screening is controversial.