Depression, specifically Major Depressive Disorder (MDD), is a serious and persistent mental health condition characterized by a pervasive low mood and/or a loss of interest or pleasure in activities. It's much more than just temporary sadness.
Key Aspects:
Symptoms:
Persistent sad, empty, or irritable mood.
Loss of interest or pleasure in most activities (anhedonia).
Significant changes in appetite or weight.
Sleep disturbances (insomnia or excessive sleeping).
Fatigue or loss of energy.
Feelings of worthlessness or excessive guilt.
Difficulty thinking, concentrating, or making decisions.
Recurrent thoughts of death or suicide.
These symptoms must be present for at least two weeks and cause significant distress or impairment in daily life.
Causes: No single cause; it's often a combination of:
Biological factors: Brain chemistry, genetics.
Psychological factors: Personality, coping styles.
Environmental factors: Stressful life events (bereavement, trauma, job loss, relationship issues), chronic illness, certain medications.
Types: While MDD is the main type, others include:
Persistent Depressive Disorder (Dysthymia): Milder symptoms, but chronic (at least 2 years).
Seasonal Affective Disorder (SAD): Depression linked to changes in seasons, usually winter.
Postpartum Depression: Occurs after childbirth.
Bipolar Disorder: Involves episodes of both depression and elevated mood (mania/hypomania).
Diagnosis: Made by a healthcare professional based on symptoms, medical history, and sometimes questionnaires. No single lab test exists.