General information for adults. Not medical or psychotherapeutic advice; not a substitute for examination, diagnosis or treatment.
What is reduced concentration?
Depression can affect attention and concentration. Following a conversation or reading may become difficult. Such observations need to be considered alongside other symptoms. [2]
Why can decisions feel demanding?
The guideline describes decision-making difficulties among possible symptoms. A seemingly small choice can feel burdensome. This describes a possibility, not every individual decision. [1]
What does rumination mean?
It refers to repeatedly circling around distressing thoughts. The guideline describes rumination and self-doubt in connection with depression. One sentence cannot reliably distinguish problem-solving from persistent repetitive thinking. [2]
Could there be other explanations?
Concentration problems alone do not establish depression. Diagnostic assessment considers other conditions and circumstances too. [1]
What can you describe concretely?
Instead of “My brain does not work”, an example might be rereading a page, losing the thread of a conversation or struggling to make a decision. This article does not provide exercises or individual therapy.
READ FURTHER & CHECK THE SOURCES
Sources and context
How should I interpret these sources?
Source notes identify the provider, their use in this article and known limitations. The source-comparison date below is not the original publication date. No update date is assumed where none is available. General findings cannot automatically be applied to an individual; independent medical review of this draft is pending.
- German National Clinical Practice Guideline · Chapter 2 ↗
Provider / domain: www.leitlinien.de
German-language clinical guideline. Used for diagnostic assessment and the limitations of questionnaires.
- German depression guideline: Background (in German) ↗
Provider / domain: www.leitlinien.de
German clinical guideline, background and risk factors; population-level relationships do not determine an individual cause. Accessed: 29 October 2026.
Research and source comparison: 29 October 2026. Prepared with AI assistance. Editorial responsibility: Mario V.W.B.R. Obst. Independent medical expert review is pending. Independent medical expert review has not taken place.