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Mental Health and Behavior
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Mental Health Behavior

Mental Health and Behavior

A comprehensive index of topics related to mental health, behavioral disorders, and psychological well-being.

Index of Topics

  • Alzheimer's Disease
  • Antidepressants
  • Anxiety
  • Attention Deficit Hyperactivity Disorder (ADD/ADHD)
  • Autism Spectrum Disorder
  • Bereavement
  • Bipolar Disorder
  • Cancer—Living with Cancer
  • Child Behavior Disorders
  • Child Mental Health
  • Compulsive Gambling
  • Coping with Chronic Illness
  • Coping with Disasters
  • Delirium
  • Dementia
  • Depression
  • Developmental Disabilities
  • Dual Diagnosis
  • Eating Disorders
  • How to Improve Mental Health
  • Learning Disabilities
  • Memory
  • Mental Disorders
  • Mental Health
  • Mild Cognitive Impairment
  • Mood Disorders
  • Obsessive-Compulsive Disorder (OCD)
  • Older Adult Mental Health
  • Panic Disorder
  • Personality Disorders
  • Phobias
  • Post-Traumatic Stress Disorder (PTSD)
  • Postpartum Depression
  • Prader-Willi Syndrome
  • Psychotic Disorders
  • Schizophrenia
  • Seasonal Affective Disorder
  • Self-Harm
  • Stress
  • Suicide
  • Teen Depression
  • Teen Development
  • Teen Mental Health

Frequently Asked Questions

Normal age-related memory loss involves occasional forgetfulness, such as misplacing keys or forgetting a name temporarily, but does not interfere with daily life. Early signs of dementia include difficulty completing familiar tasks, confusion with time or place, trouble understanding visual images, and new problems with words in speaking or writing. A key differentiator is that dementia symptoms progressively worsen over time and begin to affect a person's ability to perform independent activities, such as managing finances or cooking.
Dual diagnosis, or co-occurring disorders, refers to the presence of both a mental health condition and a substance use disorder. This complicates treatment because the symptoms of one condition can worsen the other, and treating only one issue often leads to relapse. The standard approach is integrated care, where a multidisciplinary team treats both conditions simultaneously. This ensures that medication, therapy, and support systems address the root causes of both the psychological and behavioral symptoms.
Normal stress is a temporary reaction to life events that typically resolves once the situation improves, whereas a clinical disorder involves persistent symptoms that significantly impair daily functioning, relationships, or work performance. For example, feeling anxious before an exam is normal, but having panic attacks for weeks that prevent you from leaving your home indicates a disorder. A healthcare provider can distinguish between the two through a detailed evaluation of symptom duration, severity, and impact on your quality of life.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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