Positive stress, on the other hand, is known as eustress, and is generally regarded as beneficial. I am not aware of a term for expected stress. Distress isn't a disease either, it can be a symptom for a disease, but it is not actually a disease itself.
Histamines are chemicals that your body makes up to help get rid of something that’s bothering you. in relation to allergies, histamines help you get rid of by coughing, sneezing, itching, etc.
