Seasonal affective disorder, also known as seasonal depression, causes depressive symptoms during only certain times of the year... and there's a pattern to it?!
In English, it's abbreviated to SAD.
Abgekürzt wird es SAD.
En inglés se abrevia con SAD.
En inglés se abrevia con SAD.
En anglais, l’abréviation est SAD.
In inglese si abbrevia in SAD.
Em inglês, abrevia-se como SAD.