When a depressive episode ends, many people still do not feel like their old selves. This feeling is completely normal. Experts distinguish between two types of after-effects:

• Residual Symptoms: These are remaining complaints directly after the acute phase has subsided. Directly following the end of an acute episode, many individuals (studies report over 50%) still experience at least one lingering symptom (Source: PubMed).
• Long-Term Effects: These are more prolonged, long-term problems, such as persistent sleep disturbances, ongoing concentration difficulties, or even relapses. After about one year, approximately every second person is not yet completely symptom-free or reports experiencing ongoing limitations in daily life (Sources: PubMed).

The primary difference lies in the timeframe and severity: residual symptoms are immediate carry-overs that remain right after a depressive episode, whereas long-term effects can manifest as distinct secondary illnesses, chronic depression, anxiety disorders, or a relapse into a brand-new episode. Simply put: residual symptoms are the echo of a past depression, while long-term effects are prolonged, often new challenges that can develop out of the illness.

The residual symptoms that frequently linger despite the fading of core symptoms often include:

• Persistent lack of drive and fatigue.
• Sleep disturbances or non-restorative sleep.
• Endless rumination.
• Social withdrawal and difficulties connecting with others.
• Cognitive issues such as a poor attention span.

These remaining complaints are by no means trivial. They noticeably diminish quality of life and increase the risk of slipping into a new depressive episode.

Mental Activity

• Typical Long-Term Effects: Brain fog, decision fatigue, slowed thoughts, and memory problems.
• How to Counteract: Break tasks down into small pieces. Use visual memory aids. Focus on only one thing at a time. Seek medical support if there is no improvement over several months.

Physical Health

• Typical Long-Term Effects: Increased risk of cardiovascular diseases and metabolic problems.
• How to Counteract: Incorporate physical activity into your daily routine, maintain or reduce your weight, quit smoking, and have your blood pressure and blood sugar checked regularly.

Sleep

• Typical Long-Term Effects: Persistent sleep disturbances and resulting severe fatigue.
• How to Counteract: Maintain consistent sleep and wake times, avoid media before going to bed, and ensure plenty of daylight in the morning. Your bedroom should also be cool, quiet, and dark.

When the most severe symptoms of depression begin to fade and a sense of gaining control back over life returns, a highly critical phase begins: maintenance therapy. It is a completely natural human reaction to want to ease up during this period of improvement, but right now it is vital to stay the course, start this form of therapy early, and follow through consistently over a longer period.

Maintenance therapy for depression is the continuation of treatment after acute symptoms have subsided to consolidate stability and prevent both long-term effects and relapses. It usually lasts between 6 to 12 months and typically involves continuing psychotherapy with longer intervals between individual sessions.

Goals of Maintenance Therapy

• Stabilization: Maintaining the achieved state of symptom remission or significant improvement.
• Treatment of Residual Symptoms: Targeting remaining complaints such as sleep disturbances or a lack of energy.
• Relapse Prevention: Preventing new depressive episodes from occurring.

Psychological treatments, such as Cognitive Behavioral Therapy (CBT), have proven to be exceptionally effective during this phase. Studies demonstrate that these interventions can significantly lower the risk of relapse. Maintenance therapy equips individuals with vital tools to recognize early warning signs, take swift countermeasures, and permanently change unhelpful patterns of thinking or behavior. Anyone who steadily continues their treatment during this phase—whether through psychotherapy, medication, or a combination of both—is making a long-term investment in their recovery and quality of life.

An excellent supplement to therapy and a source of daily support is deprexis. This Digital Health Application (DiGA) is based on the proven principles of Cognitive Behavioral Therapy (CBT). It offers valuable knowledge, daily inspiration, and practical exercises, helping you navigate the phase of residual symptoms and prevent long-term effects. Your doctor or psychotherapist can write you a prescription for deprexis, and the costs are typically fully covered by health insurance providers.

After experiencing depression, the goal is to actively manage any remaining limitations and reshape your life. This applies to your social connections and work, as well as addressing potential physical causes for persistent symptoms. There are many ways you can reduce stress, find support, and improve your quality of life step-by-step.

The long-term effects of depression often have a strong impact on your social environment. They limit not only you but also your interactions with others—whether in a relationship, at university, or on the job. It is completely normal if you do not yet feel as resilient as you used to. Therefore, try not to be too hard on yourself.

• Phased Reintegration: Do not jump back in at 100 percent right away. A step-by-step plan helps you take on a little more responsibility week by week without overwhelming yourself. In Germany, healthcare professionals refer to this structured return to work as the "Hamburger Modell."
• Clear Priorities: Define what is truly important. Give yourself permission to let non-essential tasks slide, and set clear boundaries.
• Open Communication: If it feels right to you, talk to your partner, family, or close friends about your early warning signs and how they can best support you.
• Exercise Your Rights: Returning to the workplace often succeeds much better by utilizing a phased reintegration program, company integration management, and occupational rehabilitation services.

If you suffer from lingering complaints such as fatigue or concentration difficulties, it is important to have a medical evaluation to determine their true origin. Many conditions that occur after infections cause symptoms that are very similar to the long-term effects of depression or can worsen existing symptoms. Your doctor must therefore check whether your complaints are residual symptoms of depression or if an infection is acting as the trigger or amplifier behind them.

Infection: Meningitis

• Consequences resembling depression: Following recovery from meningitis, fatigue and low mood can persist—similar to the aftermath of depression. If you experience difficulties concentrating, you should have this evaluated by a neurological specialist clinic.

Infection: Long COVID

• Consequences resembling depression: The so-called Post-COVID-19 condition can last for months and is often accompanied by severe fatigue, sleep disturbances, and also depression. In this case, an evaluation by an internist or a neurologist is recommended.

Infection: Glandular Fever

• Consequences resembling depression: Current research indicates a link between the Epstein-Barr virus, the trigger of glandular fever, and depression. It is suspected that inflammatory neurotransmitters might play a role. Therefore, medical clarification is important if exhaustion is prolonged.