General information for adults. Not medical or psychotherapeutic advice; not a substitute for examination, diagnosis or treatment.
When available energy changes
Reduced drive and tiring quickly can be part of depression. Personal care or housework may become difficult. This is a possible effect of the condition, not a diagnosis based on one everyday situation. [1]
Thinking and deciding also take effort
Problems with concentration and decision-making can occur too. A task may require more than physical energy: getting started, making choices, working out an order and staying with it. [1]
What is hidden in “just getting groceries”?
A thought experiment: What is missing at home? What do I need? When will I leave? How will I get there? One item on a to-do list may contain many decisions. This illustrates demands; it is not a medical explanation for every personal difficulty.
Why is each day not necessarily the same?
Symptoms and patterns of depression differ between people. Some experience recurring episodes; others have persistent symptoms. Yesterday’s achievement is not a reliable measure for today. [2]
What can you conclude?
Exhaustion alone does not establish depression. Other health explanations may need to be considered. If managing daily life remains difficult, a qualified professional can help put those changes into context. [1]
A question to take with you
You could prepare a concrete example for a consultation: Which task is difficult, since when, and at which step? An observation describes the situation more clearly than “I cannot do anything”. This is conversation preparation, not treatment advice.
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.
- IQWiG · InformedHealth.org: Depression ↗
Provider / domain: www.informedhealth.org
Plain-language overview. Used for terminology, symptoms and course.
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.