hi.

i have two questions. how do doctors and psychiatrists differentiate between mild, moderate, and severe depression (mdd)?

also, at what point to doctors advise hospitalization for depression? everything i've heard has said "if you are a risk to yourself, or at risk of harming yourself or killing yourself." what does "harming" mean? like cutting? or suicidal actions? at what point do suicidal thoughts land you in the hospital?

(i'm a minor between the ages of 12-15 if that helps)

thank you