Clinical depression, also termed major depressive disorder, is a psychiatric condition characterized by persistent depressed mood or loss of interest and pleasure, lasting at least two weeks and accompanied by symptoms such as changes in sleep, appetite, and energy, feelings of worthlessness or hopelessness, impaire…
Clinical depression, also termed major depressive disorder, is a psychiatric condition characterized by persistent depressed mood or loss of interest and pleasure, lasting at least two weeks and accompanied by symptoms such as changes in sleep, appetite, and energy, feelings of worthlessness or hopelessness, impaired concentration, and in severe cases suicidal thoughts. It is distinguished from transient sadness by its duration, severity, and functional impact on daily life. The disorder arises from an interplay of biological, psychological, and social factors, including neuroendocrine dysregulation reflected in altered cortisol levels, structural and functional brain changes, genetic vulnerability, and environmental stressors. Depression frequently coexists with other illnesses, and research examines its overlap with cognitive impairment and dementia, its distinction from apathy, and its presentation in people with chronic medical conditions such as kidney disease and cancer. Accurate diagnosis requires differentiating depression from conditions with similar features and assessing severity, including the degree of hopelessness in affected individuals. Treatment combines psychotherapy, notably cognitive behavioral and rumination-focused approaches, with pharmacological agents and, in some cases, neuromodulation, alongside attention to social support. Effective management improves mood, restores function, and reduces the risk of relapse and associated mortality.
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