The symptoms of depression usually vary. They do not all have to occur at the same time, sometimes there are only a few, but they are particularly severe.
This is why the checklist cannot give a definitive answer. Rather, it is a point of reference.
On this list, you can find symptoms, signs and signals of a depression.
If several questions can be answered with a yes, professional help should be sought. This is because only professionals can really determine, whether it is a depression or not and, of course, help in case of doubt.