Introduction
Depression is a common and serious mental health condition that causes persistent feelings of sadness, hopelessness, and a loss of interest or pleasure in activities once enjoyed. It affects how a person thinks, feels, and functions in daily life. Depression is not a sign of weakness or a character flaw — it is a medical condition that responds well to treatment, and millions of people successfully manage it with professional help.
Causes
Depression results from a combination of genetic, biological, environmental, and psychological factors. Imbalances in brain neurotransmitters such as serotonin, dopamine, and norepinephrine play a role, as do hormonal changes, chronic illness, certain medications, and significant life stressors such as loss, trauma, or prolonged stress. A family history of depression increases individual risk, and episodes can be triggered by major life changes even without a clear cause.
Symptoms
Symptoms may include persistent sad, anxious, or "empty" mood; loss of interest in hobbies and activities; fatigue; sleep disturbances (too much or too little); changes in appetite and weight; difficulty thinking, concentrating, or making decisions; feelings of worthlessness or excessive guilt; physical symptoms such as headaches or digestive problems without clear cause; and thoughts of death or suicide.
Diagnosis
A mental health professional or physician diagnoses depression through a clinical interview, review of symptoms and medical history, and use of standardized screening tools such as the PHQ-9. DSM-5 criteria for major depressive disorder require five or more specific symptoms present most of the day, nearly every day, for at least two weeks, with at least one symptom being depressed mood or loss of interest, causing significant impairment.
Treatment
Depression is highly treatable. Psychotherapy, particularly cognitive behavioral therapy (CBT), helps patients identify and change negative thought patterns and develop coping skills. Antidepressant medications such as SSRIs and SNRIs are effective for moderate to severe depression. A combination of therapy and medication often produces the best outcomes. Advanced treatments such as transcranial magnetic stimulation (TMS) or Spravato (esketamine) may be recommended for treatment-resistant cases.
This information is intended for educational and informational purposes only. It should not be used in place of an individual consultation or examination or replace the advice of your health care professional and should not be relied upon to determine diagnosis or course of treatment.