Allergic reactions to the Pfizer or Moderna COVID vaccines are very rare, and a new study questions whether many of those that do occur are even real.

In a small new study of 16 people who said they'd experienced an allergic reaction to a dose of the Pfizer vaccine, those who got a follow-up placebo (fake) vaccine were more likely to complain of another round of "allergic" reacti...

Patients with advanced cancer often suffer crippling fatigue, but there has been little in the way of relief for them as they battle their disease.

Now, a new investigation may have landed on a surprising solution -- a dummy pill that contains no medication of any kind.

"Cancer-related fatig...

Illustrating the power of the mind to heal itself, new research suggests that the placebo effect could help drive antidepressants' effects against anxiety disorders.

The placebo effect refers to an increase in the success of a treatment when a patient expects a benefit.

In the new study, patients with s...