Symptoms of Depression

Symptoms of Depression – Introduction

Depression is one of the most serious and prevalent mental health disorders worldwide. According to the World Health Organization (WHO), over 280 million people suffer from it, and by 2030, it is projected to become the most common disease globally. In Poland, 2023 data shows that nearly 810,000 patients received medical services for depression as a primary or comorbid condition. Furthermore, approximately 1.7 million people purchased reimbursed antidepressant medications—a 59% increase compared to 2013 (National Health Fund [NFZ] data).

Despite the magnitude of these figures, the problem remains underestimated, as a significant portion of those affected never seek help. It is estimated that 50–60% of people living with depression worldwide are never diagnosed or treated (WHO, 2017). In Poland, depression is the third most frequent mental disorder, affecting approximately 5.3% of the population over the age of 15.

Effective support begins with knowledge. The ability to recognize the symptoms of depression—by the sufferers themselves, their loved ones, and healthcare professionals—is a prerequisite for early intervention. This article aims to provide comprehensive, evidence-based information on depressive symptoms, their diagnostic classification, variations across gender and age, and guidance on when and how to seek professional help.

What is Depression? Clinical Definition

In a medical context, depression (from the Latin depressio – to press down or sink) is not merely a “bad mood” or a bout of temporary sadness. It is a mental disorder with a documented biological, psychological, and social foundation, affecting emotional, cognitive, somatic, and behavioral functioning. Unlike the natural response to grief or stress, clinical symptoms of depression persist for at least two weeks, are present for most of the day nearly every day, and significantly impair one’s ability to navigate daily life.

Depression is associated with the dysregulation of key neurotransmitter systems in the brain—specifically the serotonergic, noradrenergic, and dopaminergic systems—as well as disturbances in the HPA axis and neuroplastic changes in brain structures such as the hippocampus, prefrontal cortex, and amygdala [Malhi & Mann, The Lancet, 2018]. This means that the symptoms of depression have a concrete biological dimension; they are not the result of a “weak will” or a lack of motivation.

It is vital to emphasize the difference between sadness (a natural emotion in response to difficult events) and clinical depression. As indicated by the DSM-5, the dominant feelings in grief are emptiness and a sense of loss, with the intensity of the pain gradually subsiding. In a depressive episode, however, the low mood is more persistent, pervasive, and often disconnected from any specific thought or memory [APA, DSM-5].

Diagnostic Criteria for Depressive Symptoms – ICD-11 and DSM-5

Depression is diagnosed according to established medical classifications: the International Classification of Diseases, 11th Revision (ICD-11, WHO)—the standard used in Poland—and the Diagnostic and Statistical Manual of Mental Disorders, 5th Edition (DSM-5, APA)—which originated in the US and is increasingly used globally.

ICD-11 Criteria

According to ICD-11 (code 6A70), a depressive episode is defined by the presence of at least five of the symptoms listed below for at least two weeks. Crucially, at least two of these must be “core” symptoms:

Core Symptoms (Required):

• Markedly depressed mood most of the day, nearly every day (feelings of sadness, emptiness, or hopelessness; in children, often presenting as irritability).
• Markedly diminished interest or pleasure in almost all activities (anhedonia).
• Decreased energy or increased fatigue.

Additional Symptoms (At least two required):

• Reduced concentration and attention, or indecisiveness.
• Lowered self-esteem or excessive guilt.
• A sense of hopelessness about the future.
• Suicidal thoughts, behaviors, or self-harm.
• Sleep disturbances (insomnia or hypersomnia).
• Changes in appetite or weight.
• Psychomotor agitation or retardation (slowing down).

ICD-11 further classifies episodes by severity: mild (5–6 symptoms), moderate (7 or more symptoms with significant impairment), and severe (nearly all symptoms present, often with psychotic features).

DSM-5 Criteria

The DSM-5 requires at least five out of nine criteria to be met for at least two weeks, with at least one being either a depressed mood or anhedonia:

1. Depressed mood most of the day, nearly every day.
2. Diminished interest or pleasure in all, or almost all, activities.
3. Significant weight or appetite change.
4. Insomnia or hypersomnia nearly every day.
5. Psychomotor agitation or retardation observable by others.
6. Fatigue or loss of energy.
7. Feelings of worthlessness or excessive/inappropriate guilt.
8. Diminished ability to think, concentrate, or make decisions.
9. Recurrent thoughts of death or suicidal ideation (with or without a plan).

Symptoms must cause significant distress or impairment in social, occupational, or other important areas of life.

Dysthymia – Chronic Low Mood

In addition to episodic depression, there is dysthymia (referred to in DSM-5 as Persistent Depressive Disorder). This is diagnosed when a depressed mood and at least two additional symptoms persist for at least two years in adults (one year in children), without a break longer than two months. While often less intense than major depression, its chronic nature can be devastating to one’s quality of life.

Detailed Description of Depressive Symptoms

Depression rarely limits itself to a single type of ailment. In clinical practice, symptoms are categorized into four primary areas: emotional, cognitive, somatic, and behavioral. Understanding this multidimensionality is essential for both diagnosis and providing empathetic support.

Emotional Symptoms of Depression

While low mood is the axial symptom, it is rarely just “sadness.” Patients often describe a sense of profound internal emptiness, “grayness,” or a total emotional detachment.

• Anhedonia: The inability to experience pleasure from previously enjoyed activities (hobbies, social contact, sex, food, music). This is a hallmark biological indicator of depression.
• Irritability and Outbursts: Frequently underestimated, especially in men and adolescents. A person may react with disproportionate anger to minor inconveniences.
• Anxiety and Agitation: Co-occurring in 40–50% of cases, manifesting as generalized worry, panic attacks, or constant restlessness.
• Guilt and Worthlessness: Part of “Beck’s Cognitive Triad” (negative view of self, world, and future). Patients often take responsibility for events beyond their control.
• Hopelessness: A loss of belief that things can ever improve; this is a critical warning sign that requires urgent clinical evaluation.

Cognitive Symptoms of Depression

Depression significantly impacts how the brain processes information.

• Concentration and Memory Issues: Often described as “brain fog,” where focusing on a simple text or finding words becomes exhausting. In seniors, this can be so severe it is mistaken for dementia.
• Rumination: Intrusive, circular thinking about past failures or guilt. Neurobiologically, this is linked to hyperactivity in the brain’s “Default Mode Network” (DMN).
• Indecisiveness: Paralyzing hesitation over even trivial choices (e.g., what to wear or eat).
• Negative Thought Patterns: Automatic “catastrophizing” or selective attention, where only negative aspects of reality are perceived.

Somatic (Physical) Symptoms of Depression

Depression is a whole-body disease. Physical symptoms are often the only reason a patient initially visits a doctor.

• Sleep Disturbances: Insomnia (difficulty falling asleep or waking up at 3–4 AM) or hypersomnia (excessive daytime sleepiness).
• Fatigue: A constant lack of energy, often described as “leaden limbs,” where even minor effort leads to total exhaustion.
• Aches and Pains: Unexplained headaches, back pain, or joint pain (often referred to as “Masked Depression”).
• Digestive and Sexual Issues: Nausea, IBS, and a significant drop in libido are common.

Behavioral Symptoms of Depression

These are the visible changes in how a person interacts with their environment.

• Social Withdrawal: Gradually “disappearing” from social circles, stopping responses to messages, or avoiding family gatherings.
• Neglect of Responsibilities: Missing work or school. In 2023, mental health issues accounted for over 1.4 million medical leaves in Poland.
• Neglect of Hygiene: A visible signal of worsening severity, where the person stops bathing, changing clothes, or caring for their appearance.
• Substance Use: Using alcohol or drugs as a form of “self-medication” to numb emotional pain.

Symptoms of Depression and Gender – Key Clinical differences

Traditional statistics suggest that women are diagnosed with depression twice as often as men. In Poland, 2023 NFZ data shows that approximately 74% of patients diagnosed with a depressive episode are women. However, many researchers argue that men suffer just as frequently but are underdiagnosed because their symptoms often present in an atypical, “masked” way [Puls Medycyny, 2018].

Symptoms of Depression in Women

In women, depression more commonly aligns with the “classical” image of the disorder:

• Dominant Sadness and Tearfulness: A frequent tendency toward crying and visible sorrow.
• Rumination: Higher rates of circular, negative thinking and intense feelings of guilt.
• Hormonal Links: Depression in women is often tied to reproductive cycles, such as Postpartum Depression (PPD)—affecting 10–15% of mothers—Premenstrual Dysphoric Disorder, or perimenopausal depression.
• Higher Help-Seeking: Women are generally more likely to consult specialists, leading to better detection.

Symptoms of Depression in Men

Men often “act out” their depression rather than “feeling” it in a typical way. Instead of sadness, the following may dominate:

• Irritability and Anger: Outbursts of rage, verbal aggression, or physical hostility.
• Escapism: “Workaholism,” excessive risk-taking, or compulsive behaviors (e.g., gambling).
• Substance Abuse: Using alcohol or drugs to “numb” internal distress.
• High Suicide Risk: While fewer men are diagnosed, they account for 85% of completed suicides in Poland (KGP data). This suggests a tragic “diagnostic gap” where male depression goes unrecognized until it is too late.

Symptoms of Depression Across Age Groups

Children (Up to Age 12)

Childhood depression is frequently overlooked because children lack the vocabulary to describe their internal state.

• Regression: Returning to earlier developmental stages (e.g., bedwetting).
• Physical Complaints: Frequent stomach aches or headaches without a medical cause.
• Irritability: “Crabbiness” or crying rather than a persistent “sad” mood.
• Loss of Interest in Play: A sudden lack of curiosity or joy in toys and games.

Adolescents

Teenage depression is often dismissed as “typical rebellion.” Warning signs include:

• Social Isolation: Not just from parents, but sudden withdrawal from friends.
• Academic Decline: A sharp drop in grades or school attendance.
• Self-Harm: Cutting or other forms of self-injury.
• Risky Behavior: Early substance use or sexual impulsivity.

Seniors

In the elderly, depression is often mistaken for the “natural process of aging” or dementia.

• “Pseudodementia”: Severe memory and concentration issues that look like cognitive decline but are actually caused by depression.
• Somatic Dominance: A preoccupation with physical ailments and fatigue.
• Social Loneliness: Withdrawal following bereavement or a loss of mobility.
• “Setting Affairs in Order”: A sudden interest in wills or giving away possessions, combined with a sense of being a “burden.”

Atypical and Masked Depression – Symptoms Easily Overlooked

Atypical Depression

Atypical depression (classified in the DSM-5 as a specifier “with atypical features”) is characterized by mood reactivity—meaning the person can temporarily feel better in response to positive events, unlike in melancholic depression where nothing brings joy.

Other key features include:

• Hypersomnia: Excessive sleepiness or sleeping for very long periods.
• Increased Appetite: A strong craving for carbohydrates and sweets, leading to weight gain.
• Leaden Paralysis: A heavy, weighted-down feeling in the arms and legs.
• Rejection Sensitivity: An extreme, long-standing sensitivity to interpersonal slights or perceived rejection.

This is often referred to as “High-Functioning Depression.” On the outside, the person may appear “normal,” successful, and social, but they “crash” and experience deep symptoms the moment they are alone and without external stimulation.

Masked (“Somatic”) Depression

In masked depression, the emotional low is hidden behind a “mask” of physical ailments. The patient often visits cardiologists, neurologists, or gastrologists for years without a clear diagnosis.

Common “masks” include:

• Recurring migraines and tension headaches.
• Chest pains mimicking heart disease.
• Irritable Bowel Syndrome (IBS) and chronic stomach pain.
• Persistent back, muscle, or joint pain.
• Dizziness and heart palpitations.

Depressive Symptoms and Comorbidities – Differential Diagnosis

Depression rarely travels alone. Anxiety disorders co-occur in 40–50% of patients, and substance abuse often creates a “vicious cycle” where each condition worsens the other.

It is crucial for a specialist to perform a differential diagnosis to ensure the symptoms aren’t actually caused by something else:

• Bipolar Disorder (BD): It is vital to determine if the patient has ever had “highs” (mania or hypomania). Treating bipolar depression with standard antidepressants alone can trigger a dangerous manic episode.
• Anxiety Disorders: GAD, PTSD, or OCD can mimic or overlap with depressive symptoms.
• Medical Conditions: Hypothyroidism, anemia, or Vitamin B12/D deficiencies can cause identical symptoms. These should always be ruled out with blood tests.
• Neurological Issues: Parkinson’s disease, Multiple Sclerosis (MS), and early-stage dementia often present with depression.
• Medication Side Effects: Certain beta-blockers, corticosteroids, or hormonal contraceptives can induce depressive moods.
• Grief: While natural, grief differs from clinical depression by the absence of pervasive worthlessness and the ability to still experience moments of humor or joy.

Screening Tools in Diagnosing Depressive Symptoms

In daily clinical practice, standardized questionnaires and self-assessment scales are used to evaluate the severity of symptoms. While these are valuable additions to a clinical interview, they do not replace a medical diagnosis.

The Screening Checklist

• PHQ-9 (Patient Health Questionnaire-9): A 9-item self-report tool used globally. It tracks the 9 DSM-5 symptoms over the last 2 weeks.
  • Scoring: 0–4 (None); 5–9 (Mild); 10–14 (Moderate); 15+ (Severe).
• BDI-II (Beck Depression Inventory): A 21-question survey focusing on the intensity of symptoms. It is a gold standard in both clinical settings and research.
• GDS (Geriatric Depression Scale): Specifically designed for seniors, using simplified “yes/no” questions to account for age-related cognitive changes.
• HDRS (Hamilton Scale): Unlike the others, this is a “hetero-assessment” scale, meaning it is filled out by the clinician while observing the patient.

The Stigma of Depression – Why Seek Help So Late?

Despite growing awareness, depression remains heavily stigmatized. Sufferers are often accused of “faking it,” manipulation, laziness, or having a “weak character.” These reactions—often born out of a loved one’s helplessness—only deepen the patient’s guilt and shame.

• The Global Gap: 50–60% of people with depression worldwide are never diagnosed (WHO, 2017).
• The Gender Gap: In Poland, men are significantly less likely to seek help due to traditional “toughness” stereotypes, which correlates with the high male suicide rate.
• The Reality: Depression is a medical condition, much like diabetes or hypertension. It has a documented biological basis, and seeking help is an act of courage, not a sign of weakness.

When and How to Seek Help? First Steps

If symptoms persist for at least 2 weeks, occur almost every day, and interfere with your life—it is time to consult a professional.

1. Primary Care Physician (GP): Can perform an initial assessment and order blood tests to rule out physical causes.
2. Psychiatrist: In Poland, you do not need a referral for a psychiatrist under the NFZ.
3. Psychotherapist: Ensure they are certified by an accredited school (e.g., PTTPiB or PTPD).

Support Lines in Poland

• Adult Crisis Hotline: 116 123 (24/7, free)
• Child and Youth Hotline: 116 111
• Senior Support Line: 22 635 09 54
• Emergency Number: 112

Summary – Key Symptoms to Remember

Depression is a multi-dimensional disorder. Seek help if you notice:

• Persistent low mood or anhedonia (loss of joy).
• Chronic fatigue and “leaden” limbs.
• Sleep and appetite changes.
• Brain fog and difficulty making decisions.
• Social withdrawal and neglect of self-care.
• Any thoughts of death or self-harm (Requires IMMEDIATE action).

Early diagnosis and the commencement of treatment are critical to a patient’s prognosis. When treated appropriately, depression leads to significant improvement or full remission in the vast majority of cases. Conversely, untreated depression tends to be recurrent and chronic, leading to escalating health, professional, and social consequences.

Bibliography

1. Malhi G.S., Mann J.J. (2018). Depression. The Lancet, 392(10161), 2299–2312. https://doi.org/10.1016/S0140-6736(18)31948-2
2. Katon W. (2003). The comorbidity of depression and medical illness. Journal of Clinical Psychiatry, 64(7), 22–27. https://www.psychiatrist.com/jcp/depression-comorbidity-medical-illness/
3. World Health Organization (2017). Depression and Other Common Mental Disorders: Global Health Estimates. WHO. https://www.who.int/publications/i/item/depression-global-health-estimates
4. American Psychiatric Association (2013). Diagnostic and Statistical Manual of Mental Disorders, 5th ed. (DSM-5). Washington, DC: APA.
5. WHO (2022). International Classification of Diseases, 11th Revision (ICD-11). https://icd.who.int/
6. Cuijpers P. et al. (2020). The efficacy of psychotherapy and pharmacotherapy in treating depressive and anxiety disorders. World Psychiatry, 19(1), 88–89. https://doi.org/10.1002/wps.20728
7. Chodkiewicz J., Miniszewska J. (2016). Męska depresja – koncepcja, metody pomiaru i związki z zachowaniami samobójczymi. Psychiatria i Psychologia Kliniczna, 16(1), 33–37.
8. Talarowska M.E., Gromniak-Haniecka E., Rawska J., Gałecki P. (2018). Depresja mężczyzny – przyczyny, objawy, diagnoza. Neuropsychiatria i Neuropsychologia / Neuropsychiatry & Neuropsychology, 13(3), 98–103.
9. NFZ / Galileo Medical (2023). Dane epidemiologiczne dotyczące depresji w Polsce. https://galileomedical.pl/zdrowie-psychiczne/depresja-w-polsce/
10. NFZ / medsal.pl (2023). Epidemiologia depresji i zaburzeń lękowych w Polsce. https://medsal.pl/epidemiologia-depresji-i-zaburzen-lekowych-w-polsce/
11. Komenda Główna Policji. Dane dotyczące zamachów samobójczych w Polsce (wieloletnie).
12. Forum Przeciw Depresji (2022). Dane o depresji u dzieci i młodzieży. Cytowane za: niewidacpomnie.org.
13. UNICEF (2021). Raport o zdrowiu psychicznym dzieci i młodzieży w Polsce.
14. Stahl S.M. (2021). Stahl’s Essential Psychopharmacology: Neuroscientific Basis and Practical Applications. 5th ed. Cambridge University Press.
15. Beck A.T., Rush A.J., Shaw B.F., Emery G. (1979). Cognitive Therapy of Depression. New York: Guilford Press.
16. Kroenke K., Spitzer R.L., Williams J.B.W. (2001). The PHQ-9: Validity of a brief depression severity measure. Journal of General Internal Medicine, 16(9), 606–613.
17. Malhi G.S., Mann J.J., Depression, The Lancet, 2018
    https://doi.org/10.1016/S0140-6736(18)31948-2
18. Katon W., The comorbidity of depression and medical illness, Journal of Clinical Psychiatry, 2003
    https://www.psychiatrist.com/jcp/depression-comorbidity-medical-illness/
19. World Health Organization, Depression and Other Common Mental Disorders: Global Health Estimates, 2017
    https://www.who.int/publications/i/item/depression-global-health-estimates
20. Cuijpers P. et al., Comprehensive treatments for depression, World Psychiatry, 2020
    https://doi.org/10.1002/wps.20728

Disclaimer: This article is for informational and educational purposes only. It is not intended to be a substitute for professional medical or psychological advice, diagnosis, or treatment. If you suspect that you or someone you know may be suffering from depression, please consult a qualified mental health professional immediately.