Causes & Treatment of ADHD

Causes of ADHD

ADHD is a neurodevelopmental disorder with multiple contributing factors. It is highly heritable and involves brain differences.

Biological Causes

Genetics (Primary Factor):

  • Highly heritable: 70-80% heritability
  • Runs strongly in families
  • If one parent has ADHD: 40-57% chance for child
  • Twin studies show high concordance
  • Multiple genes involved (polygenic)
  • Genes affect:
    • Dopamine regulation (DRD4, DRD5, DAT1 genes)
    • Norepinephrine systems
    • Brain development

Brain Differences:

Structural:

  • Smaller overall brain volume (3-5% smaller)
  • Reduced size in specific regions:
    • Prefrontal cortex (executive functions)
    • Basal ganglia (movement, attention)
    • Cerebellum (coordination, cognitive control)
    • Corpus callosum (connecting hemispheres)
  • Differences often decrease with age (brain development delayed)

Functional:

  • Underactivity in prefrontal cortex
  • Different activation patterns during attention tasks
  • Less efficient neural networks
  • Default mode network doesn’t deactivate properly

Neurotransmitter Differences:

  • Dopamine dysregulation: Primary neurotransmitter involved
    • Reduced dopamine activity in reward and attention circuits
    • Affects motivation and attention
  • Norepinephrine: Also involved in attention and alertness
  • Medications target these systems

Prenatal/Perinatal Risk Factors

Maternal Factors During Pregnancy:

  • Smoking
  • Alcohol use
  • Drug use (especially cocaine)
  • Severe stress
  • Nutritional deficiencies

Birth Complications:

  • Prematurity (especially very premature)
  • Very low birth weight
  • Birth complications/trauma
  • Oxygen deprivation

Environmental Toxins:

  • Lead exposure (even low levels)
  • Pesticides
  • PCBs (polychlorinated biphenyls)

Note: These are risk factors, not direct causes; interact with genetic vulnerability

Psychosocial Factors

Not Causes But May Worsen:

  • Family stress and dysfunction
  • Chaotic home environment
  • Inconsistent parenting
  • Early institutional care/neglect
  • Low socioeconomic status

Important: Poor parenting does NOT cause ADHD, but environment affects symptom expression and outcomes

Debunked Myths (NOT Causes)

  • Sugar: No evidence sugar causes ADHD
  • Food additives: Minimal effect in small subset
  • Too much TV/video games: May worsen attention but don’t cause ADHD
  • Poor parenting: Not a cause (though affects outcomes)
  • Vaccines: No link whatsoever

Treatment of ADHD

Multimodal Treatment Approach

Most Effective: Combination of medication + behavioral interventions + school supports

Pharmacological Treatment

Medications Are First-Line Treatment (especially for moderate-severe ADHD)

Stimulant Medications (Most Effective):

Methylphenidate-Based:

  • Ritalin (immediate release, 3-4 hours)
  • Concerta (extended release, 12 hours)
  • Focalin
  • Daytrana (patch)

Amphetamine-Based:

  • Adderall (mixed amphetamine salts)
  • Vyvanse (lisdexamfetamine, longest acting)
  • Dexedrine

How They Work:

  • Increase dopamine and norepinephrine in brain
  • Improve attention, reduce impulsivity and hyperactivity
  • Effects within 30-60 minutes
  • Effective in 70-80% of individuals

Benefits:

  • Improved attention and focus
  • Reduced impulsivity
  • Decreased hyperactivity
  • Better academic/work performance
  • Improved social interactions
  • Enhanced executive functioning

Side Effects (Usually Mild):

  • Decreased appetite
  • Sleep problems (insomnia)
  • Headaches
  • Stomachaches
  • Irritability (“rebound” when wears off)
  • Temporary growth slowdown (minimal, catches up)
  • Increased heart rate/blood pressure (monitor)

Misconceptions:

  • NOT addictive when used as prescribed
  • Don’t lead to substance abuse (actually reduce risk)
  • Don’t change personality
  • Effects don’t diminish over time

Non-Stimulant Medications (Second-Line):

Atomoxetine (Strattera):

  • Norepinephrine reuptake inhibitor
  • Takes 4-6 weeks for full effect
  • 24-hour coverage
  • Good if stimulants not tolerated or substance abuse concern
  • Less effective than stimulants but still helpful

Guanfacine (Intuniv) and Clonidine (Kapvay):

  • Alpha-2 agonists
  • Help with hyperactivity and impulsivity
  • Also help with sleep
  • Can be added to stimulants

Antidepressants (Rarely Used):

  • Bupropion (Wellbutrin)
  • Tricyclics (rarely, due to side effects)
  • Only if other medications fail

Medication Management:

  • Start low, increase gradually
  • Monitor effectiveness and side effects
  • Regular follow-ups
  • May need adjustments
  • “Drug holidays” (breaks) controversial; not usually recommended

Behavioral Interventions

Behavioral Parent Training (Evidence-Based):

Techniques:

  • Positive reinforcement for desired behaviors
  • Clear, consistent rules and consequences
  • Token economy systems (earning rewards)
  • Time-out for misbehavior
  • Daily report cards
  • Structured routines
  • Immediate consequences (ADHD = “now” disorder)

Programs:

  • Parent-Child Interaction Therapy (PCIT)
  • Triple P (Positive Parenting Program)
  • Incredible Years

Behavioral Classroom Interventions:

Teacher Strategies:

  • Preferential seating (front, away from distractions)
  • Frequent breaks
  • Breaking tasks into smaller steps
  • Immediate feedback
  • Daily report card communication with parents
  • Behavior charts with rewards
  • Extra time for tests
  • Reduced homework load

Behavioral Therapy for Adolescents/Adults:

  • Skills training (organization, time management)
  • Problem-solving strategies
  • Self-monitoring techniques
  • Cognitive-behavioral therapy

Psychoeducation

For Individual:

  • Understanding ADHD
  • How it affects them specifically
  • Medication education
  • Self-advocacy skills

For Family:

  • ADHD education
  • Realistic expectations
  • Strengths-based approach
  • Reducing blame and frustration

For Teachers:

  • ADHD characteristics
  • Effective classroom strategies
  • Collaboration with parents

Educational Interventions

Special Education Services (if significant impact):

  • IEP (Individualized Education Plan): If meets criteria for special education
  • 504 Plan: Accommodations without special education

Common Accommodations:

  • Extended time on tests
  • Reduced distractions (quiet room)
  • Frequent breaks
  • Note-taking assistance
  • Preferential seating
  • Breaking assignments into parts
  • Extra set of books at home
  • Organizational aids (checklist, planner)

Organizational Support:

  • Planners and checklists
  • Color-coding systems
  • Folders for each subject
  • Routine and structure
  • Homework tracking systems

Cognitive Training

Working Memory Training:

  • Computer-based programs (Cogmed)
  • Mixed evidence on effectiveness
  • May help working memory but doesn’t generalize to ADHD symptoms

Neurofeedback:

  • Training brain waves
  • Controversial; limited evidence
  • Time-consuming and expensive

Executive Function Training:

  • Teaching planning, organization, time management
  • More promising than working memory training

Lifestyle Interventions

Exercise:

  • Regular physical activity helps symptoms
  • Especially aerobic exercise
  • Helps with attention, mood, sleep
  • Should be part of treatment plan

Sleep:

  • Consistent sleep schedule
  • Adequate sleep crucial
  • Sleep problems common; address them
  • Screen time limits before bed

Diet:

  • Balanced, nutritious diet
  • Regular meals (important with medication)
  • Omega-3 supplements (modest benefit)
  • Limit caffeine
  • Note: Elimination diets (removing foods) have minimal benefit for most

Structure and Routine:

  • Predictable daily schedule
  • Visual schedules
  • Consistent rules and expectations
  • Organized environment

Technology and Apps

Helpful Tools:

  • Reminder apps
  • Task management apps (Todoist)
  • Time timers
  • Focus apps (block distractions)
  • Organizational apps

Coaching and Support

ADHD Coaching (especially for adults):

  • Goal-setting
  • Accountability
  • Strategy development
  • Problem-solving

Support Groups:

  • CHADD (Children and Adults with ADHD)
  • Parent support groups
  • Adult ADHD groups
  • Connection and shared strategies

Treatment for Different Ages

Preschool (ages 4-5):

  • Behavioral parent training first-line
  • Medication if severe and behavioral interventions insufficient
  • Structure and routine at home

School-Age:

  • Medication + behavioral interventions most effective
  • School accommodations
  • Parent training
  • Social skills training if needed

Adolescents:

  • Continue medication if helpful
  • Organizational skills training
  • Driving safety considerations
  • Transition planning
  • Address self-esteem issues

Adults:

  • Medication often helpful
  • CBT for coping strategies
  • Organizational coaching
  • Career counseling
  • Relationship therapy if needed

Treatment Effectiveness

MTA Study (Multimodal Treatment of ADHD - landmark study):

  • Medication alone: Very effective
  • Medication + behavioral therapy: Best outcomes
  • Behavioral therapy alone: Less effective than medication but still helpful
  • Community care: Least effective

Conclusion: Medication is most effective for core symptoms; combined treatment best for overall functioning

Long-Term Management

ADHD is Chronic:

  • Requires ongoing treatment
  • Symptoms may change over time
  • Hyperactivity often decreases with age
  • Inattention and executive function problems persist
  • Treatment needs change across lifespan

Prognosis:

  • With treatment: Can succeed academically, occupationally, socially
  • Without treatment: Higher risk of academic failure, job problems, accidents, substance abuse
  • Early intervention improves outcomes
  • Many adults manage successfully with appropriate support

What Doesn’t Work

Insufficient Evidence or Ineffective:

  • Sugar elimination (myth)
  • Megavitamins
  • Chiropractic adjustment
  • Vision therapy
  • Auditory training
  • Herbal supplements (most)
  • Punishment alone (worsens behavior)

Key Points for Exams

Causes:

  • Highly genetic (70-80% heritability)
  • Brain differences (prefrontal cortex, basal ganglia)
  • Dopamine and norepinephrine dysregulation
  • Prenatal factors are risks, not direct causes
  • NOT caused by parenting, sugar, or screens

Treatment:

  • Medication (stimulants) most effective for core symptoms
  • Behavioral parent training evidence-based
  • Multimodal treatment (medication + behavioral + school support) best
  • School accommodations important (IEP or 504)
  • Psychoeducation for all involved
  • Exercise, sleep, structure beneficial
  • Coaching and organizational strategies helpful
  • Treatment needed long-term
  • Prognosis good with appropriate treatment