How does excess cortisol affect the body?

Well if its excess then its probably bad and had a negative affect

A tumor in the pituitary gland of the brain or a nodule (mass) in the adrenal gland might cause your body to produce too much cortisol. Cushing syndrome can result as a result of this. It can cause rapid weight gain, easily bruised skin, muscle weakness, diabetes, and a variety of other health issues.

What do you mean exactly