nocebo

noun
UK /nəʊˈsiːbəʊ/
US /noʊˈsiːboʊ/

A nocebo is when you feel sick just because you believe something bad will happen.

She felt a headache after reading the warning label, a nocebo effect.


OTHER MEANINGS

2. A harmless substance or treatment that causes harm because a person expects it to.

The sugar pill acted as a nocebo and made him feel dizzy.

3. The harmful effect produced by negative expectations about a treatment.

Doctors must explain side effects carefully to avoid a nocebo response.

4. A situation where worrying about symptoms makes them seem real.

Her nocebo made the mild sting feel much worse.