Symptoms by Condition
Understanding the specific symptoms associated with different mental health conditions can help individuals recognize when professional support may be needed. This section organizes common psychological and psychiatric symptoms by their associated conditions.
Important: This information is for educational purposes only. It is not a diagnostic tool. If you are experiencing concerning symptoms, please consult a qualified healthcare professional.
Table of Contents
- How to Use This Guide
- ADHD Symptoms
- Autism Spectrum Disorder Symptoms
- Anxiety Symptoms
- Other Conditions & Their Symptoms
- Symptoms That Cross Multiple Conditions
- When to Seek Help
- Key Takeaways
How to Use This Guide
This resource is designed to help you:
- Identify patterns of symptoms that may relate to specific conditions
- Understand how symptoms manifest differently across conditions
- Navigate to detailed guides for each condition's symptom profile
- Find relevant self-assessment tools to explore further
- Recognize when professional evaluation may be warranted
Important reminder: Having some symptoms does not mean you have a condition. Many symptoms overlap across conditions, and only a qualified professional can provide an accurate diagnosis.
ADHD Symptoms
Attention-Deficit/Hyperactivity Disorder (ADHD) is characterized by persistent patterns of inattention, hyperactivity, and impulsivity that interfere with functioning or development.
Learn more: ADHD Symptoms: A Comprehensive Guide — complete coverage of inattention, hyperactivity, impulsivity, executive function symptoms, age-specific presentations, and self-assessment tools.
Core Symptom Domains
| Domain | Description | DSM-5 Symptoms |
|---|---|---|
| Inattention | Difficulty focusing, organizing, sustaining attention | 9 symptoms |
| Hyperactivity | Excessive movement, restlessness, difficulty staying still | 6 symptoms |
| Impulsivity | Acting without thinking, difficulty waiting, interrupting | 3 symptoms |
Common ADHD Manifestations
| Area | Examples |
|---|---|
| Work/School | Missing deadlines, incomplete work, difficulty with lectures, forgetting materials |
| Home Life | Disorganization, losing items, forgetting chores, starting but not finishing tasks |
| Relationships | Zoning out during conversations, forgetting commitments, interrupting others |
| Executive Function | Time blindness, poor planning, procrastination, emotional dysregulation |
| Physical | Restlessness, fidgeting, difficulty relaxing (inner restlessness in adults) |
Related Resources
- ADHD Overview — Full guide to ADHD including causes, diagnosis, treatment
- Types of ADHD — Understanding presentations (inattentive, hyperactive-impulsive, combined)
- ADHD in Adults — Adult-specific symptoms and challenges
- ADHD in Women — Gender-specific presentations often underrecognized
- ASRS Screening Test — Adult ADHD Self-Report Scale
- Vanderbilt ADHD Assessment — For parents/teachers rating children
Autism Spectrum Disorder Symptoms
Autism Spectrum Disorder (ASD) involves differences in social communication, restricted interests, and repetitive behaviors, with significant individual variation in presentation.
Learn more: Autism Symptoms and Traits — comprehensive guide covering social communication differences, sensory sensitivities, restricted/repetitive behaviors, co-occurring conditions, age-specific presentations, and gender differences.
Two Core Symptom Areas (DSM-5)
Social Communication Differences
- Difficulty with social-emotional reciprocity (back-and-forth conversation, sharing interests)
- Differences in nonverbal communication (eye contact, facial expressions, body language)
- Challenges developing relationships appropriate to developmental level
Restricted, Repetitive Patterns of Behavior
- Stereotyped movements or speech (hand flapping, rocking, echolalia)
- Insistence on sameness, routines, or rituals
- Highly restricted, fixated interests
- Sensory differences (hypo- or hyper-reactivity)
Sensory Processing Differences
Many autistic people experience sensory processing differences that significantly impact daily life:
| Type | Experience | Example |
|---|---|---|
| Hypersensitivity | Over-responsive to input | Overwhelmed by loud sounds, bothered by clothing textures |
| Hyposensitivity | Under-responsive to input | May not notice pain, high tolerance for sensory input |
| Sensory Seeking | Craves intense sensory input | Enjoys strong flavors, spinning, deep pressure |
Related: Sensory Overload, Hypersensitivity
Co-occurring Symptoms & Conditions
| Condition | Prevalence in ASD |
|---|---|
| Anxiety disorders | 40–50% |
| ADHD | 30–50% |
| Depression | 30–40% |
| OCD | 17–37% |
| Sleep disorders | 50–80% |
Related Resources
- Autism Spectrum Disorder Overview — Complete guide to ASD
- Levels of Autism — Understanding support levels
- Autism in Adults — Adult presentation and diagnosis
- Autism in Women — Gender-specific presentations
- Autism Screening Tests — Available assessments
- AQ Test — Autism Spectrum Quotient screening
- Systemizing Quotient Test — Cognitive style assessment
Anxiety Symptoms
Anxiety can manifest through an extraordinarily wide range of physical, cognitive, and behavioral symptoms—many of which people don't realize are connected to anxiety.
Learn more: Anxiety Symptoms: Complete Guide — comprehensive coverage organized by body system (cardiovascular, respiratory, neurological, musculoskeletal, digestive, sensory), plus psychological/emotional symptoms, unusual anxiety experiences, and validated assessment tools.
Physical Symptoms by Body System
| System | Common Symptoms |
|---|---|
| Cardiovascular | Palpitations, Chest Tightness, Chest Tremors, Pulsing/Throbbing |
| Respiratory | Shortness of Breath, Gasping for Air, Excessive Yawning |
| Neurological | Brain Fog, Brain Zaps, Dizziness, Head Pressure, Tingling Head, Confusion |
| Musculoskeletal | Muscle Tension, Muscle Twitching, Body Tremors, Weak Legs, Restless Legs |
| Sensory | Blurred Vision, Vision Problems, Phantom Smells, Kaleidoscope Vision |
| Digestive | Digestive Issues, Dry Mouth, Butterflies Stomach |
| Other Physical | Sweating, Cold Hands/Feet, Blushing, Frequent Urination |
Psychological & Emotional Symptoms
- Anxiety Crying — Emotional release through tears
- Fear of Dying — Intense fear of death during panic
- Intrusive Thoughts — Unwanted recurring thoughts
- Avoidance Behavior — Avoiding triggering situations
- Stuck Thoughts — Mental loops that won't release
- Catastrophizing — Always imagining the worst outcome
Unusual or Less-Known Anxiety Symptoms
Some anxiety-related experiences are less commonly discussed but very real:
| Symptom | Description |
|---|---|
| Falling/Dropping Sensation | Feeling like falling when still |
| Déjà Vu | Frequent "already seen" experiences |
| Electric Shock Feeling | Shock-like sensations in body |
| Body Jolt | Sudden jerking movements when falling asleep |
| Brain Zaps | Electric-shock sensations in head (common with medication changes) |
Why Anxiety Causes Physical Symptoms
Anxiety activates the body's fight-or-flight response, releasing stress hormones (adrenaline, cortisol) that affect every body system. When this response is activated frequently or chronically, it produces the wide range of physical symptoms above—even when there's no actual danger present.
Related Resources
- Anxiety Disorders Overview — Types, causes, treatments
- GAD-7 Screening — Generalized Anxiety Disorder questionnaire
- BAI — Beck Anxiety Inventory
- DASS-21 — Depression, Anxiety, Stress scale
Other Conditions & Their Symptoms
Beyond ADHD, autism, and anxiety, many other psychological and psychiatric conditions have distinct symptom profiles. Explore our full collection of condition guides and their associated symptoms:
Mood Disorders
| Condition | Key Symptoms | Learn More |
|---|---|---|
| Depression | Persistent sadness, anhedonia, fatigue, sleep/appetite changes, worthlessness, suicidal ideation | Depression Guide |
| Bipolar Disorder | Alternating manic/hypomanic and depressive episodes, mood instability | Bipolar Guide |
| Seasonal Affective Disorder | Depression with seasonal pattern (typically winter onset) | SAD Guide |
Anxiety-Related Disorders
| Condition | Key Symptoms | Learn More |
|---|---|---|
| Panic Disorder | Recurrent panic attacks, fear of future attacks, agoraphobic avoidance | Panic Disorder |
| Social Anxiety | Fear of scrutiny/negative evaluation, avoidance of social situations | Social Anxiety |
| Health Anxiety | Persistent worry about serious illness despite medical reassurance | Illness Anxiety |
| OCD | Intrusive obsessions + compulsive rituals; time-consuming distress | OCD Guide |
| PTSD | Re-experiencing trauma, avoidance, hyperarousal, negative alterations | PTSD Guide |
Dissociative Disorders
| Condition | Key Symptoms | Learn More |
|---|---|---|
| DPDR | Depersonalization (detached from self), derealization (world feels unreal) | DPDR Guide |
| DID | Multiple identity states, memory gaps, amnesia | DID Guide |
Neurodevelopmental Disorders
| Condition | Key Symptoms | Learn More |
|---|---|---|
| Specific Learning Disorder | Difficulties reading (dyslexia), writing (dysgraphia), math (dyscalculia) | Learning Disorders |
| Intellectual Disability | Limitations in intellectual and adaptive functioning | Intellectual Disability |
Personality Disorders
| Condition | Key Symptoms | Learn More |
|---|---|---|
| BPD | Instability in relationships, self-image, emotions; impulsivity; fear of abandonment | BPD Guide |
| Narcissistic PD | Grandiosity, need for admiration, lack of empathy | NPD Guide |
Other Conditions
| Condition | Key Symptoms | Learn More |
|---|---|---|
| Schizophrenia | Hallucinations, delusions, disorganized thought, negative symptoms | Schizophrenia |
| Eating Disorders | Disturbed eating behaviors, body image disturbance | Eating Disorders |
| Sleep Disorders | Insomnia, hypersomnia, sleep apnea, circadian rhythm issues | Sleep Disorders |
| Somatic Symptom Disorder | Distressing physical symptoms with excessive thoughts/behaviors | Somatic Symptom Disorder |
| Hoarding Disorder | Difficulty discarding possessions, cluttered living spaces | Hoarding Disorder |
| Gambling Disorder | Persistent problematic gambling behavior | Gambling Disorder |
| Addiction | Compulsive substance use despite harmful consequences | Addiction Guide |
| Body Dysmorphic Disorder | Preoccupation with perceived appearance flaws | BDD Guide |
| Grief & Bereavement | Prolonged/intense grief reaction following loss | Grief Guide |
| Gender Dysphoria | Marked incongruence between experienced/expressed gender | Gender Dysphoria |
| Alzheimer's Disease | Progressive memory loss, cognitive decline | Alzheimer's |
Symptoms That Cross Multiple Conditions
Many symptoms appear across multiple conditions, which is why professional diagnosis is essential:
High-Overlap Symptoms
| Symptom | Commonly Associated With |
|---|---|
| Brain Fog | Anxiety, depression, ADHD, chronic fatigue, fibromyalgia, long COVID |
| Fatigue / Exhaustion | Depression, anxiety, ADHD, thyroid disorders, sleep apnea, anemia |
| Sleep Problems | Nearly all psychiatric conditions; also medical causes |
| Irritability | Depression, anxiety, ADHD, bipolar, PMDD, sleep deprivation |
| Concentration Difficulties | ADHD, depression, anxiety, sleep deprivation, thyroid issues |
| Muscle Tension | Anxiety, depression, chronic pain, stress disorders |
| Avoidance | Anxiety disorders, PTSD, depression, phobias, OCD |
| Intrusive Thoughts | OCD, anxiety, PTSD, depression, eating disorders |
| Social Difficulties | Autism, social anxiety, ADHD, schizophrenia, depression |
| Emotional Numbness | Depression, PTSD, dissociative disorders, burnout |
Why Overlap Matters
This overlap explains why:
- Self-diagnosis is unreliable — the same symptom can indicate very different conditions
- Comorbidity is common — many people meet criteria for more than one condition
- Professional evaluation is essential — clinicians use structured interviews and differential diagnosis
- Treatment must match the condition — what helps for anxiety may not help for ADHD, even if both involve concentration problems
When to Seek Help
Consider consulting a healthcare professional if you experience:
Red Flags Requiring Prompt Attention
- Symptoms that significantly interfere with work, school, relationships, or daily responsibilities
- Persistent symptoms lasting more than 2 weeks without improvement
- Thoughts of self-harm or suicide
- Sudden, severe changes in mood, behavior, or personality
- Hallucinations or delusions (seeing/hearing things others don't; fixed false beliefs)
- Using substances (alcohol, drugs) to cope with symptoms
- Physical symptoms (chest pain, severe breathing difficulties) — seek immediate medical attention
Finding the Right Professional
| Provider | Best For |
|---|---|
| Primary Care Physician | Initial evaluation, ruling out medical causes, referrals |
| Psychiatrist | Diagnosis, medication management, complex cases |
| Clinical Psychologist | Psychotherapy, comprehensive testing, diagnosis |
| Licensed Therapist/Counselor | Talk therapy, coping strategies, ongoing support |
| Neuropsychologist | Comprehensive cognitive and psychological testing |
What to Expect in an Evaluation
- Clinical interview — Detailed history of symptoms, duration, triggers, impact
- Standardized measures — Validated questionnaires and rating scales
- Medical review — Rule out physical causes (thyroid, vitamins, medications)
- Collateral information — Sometimes input from family members or teachers
- Diagnostic formulation — Clinician shares findings and discusses options
Key Takeaways
- Symptoms vary widely within and across conditions — no two people present exactly alike
- ADHD centers on inattention, hyperactivity, and impulsivity — with significant executive function impacts
- Autism involves social communication differences and restricted/repetitive behaviors — plus sensory processing variations
- Anxiety produces remarkably diverse physical symptoms — affecting nearly every body system via fight-or-flight activation
- Many symptoms overlap across conditions — making professional differential diagnosis essential
- Comorbidity is the rule, not the exception — having more than one condition is common
- Self-assessment tools help identify patterns — but cannot replace professional evaluation
- Early recognition and intervention improve outcomes — don't hesitate to seek help
Related Resources
Symptom Guides by Condition
- ADHD Symptoms — Inattention, hyperactivity, impulsivity, executive function
- Autism Symptoms — Social communication, sensory, repetitive behaviors
- Anxiety Symptoms — Physical, cognitive, behavioral signs by body system
Individual Symptom Pages
Browse our complete library of 50+ individual symptom pages at /docs/symptoms, covering everything from brain zaps to palpitations to déjà vu.
Self-Assessment Tools
Explore validated screening tests to learn more about your experiences:
| Domain | Tools |
|---|---|
| Anxiety | GAD-7, BAI, DASS-21 |
| Depression | PHQ-9, BDI-II |
| ADHD | ASRS, Vanderbilt |
| Autism | AQ, SQ |
| OCD | OCI-R, Y-BOCS |
| Dissociation | DES |
| Stress | PSS, DASS-21 |
Condition Overviews
- All Mental Health Conditions — Browse our complete condition library
- Understanding Mental Illness — General overview of psychiatric conditions