Evidence-Based Supplement & Herb Guides

Neuropsychiatric Disorder Signs, Risk Factors, and Diagnostic Context

Neuropsychiatric disorder refers to symptoms where brain function and mental health overlap, including mood, cognition, behavior, perception, causes, risks, complications, and warning signs that may need evaluation.

A neuropsychiatric disorder is not one single diagnosis. It is a broad term used when changes in brain function are closely connected with changes...

Neuroleptic Malignant Syndrome Signs, Complications, and Urgent Red Flags

Learn what neuroleptic malignant syndrome is, how its symptoms and signs appear, which medication triggers and risk factors matter, and why urgent evaluation is important.

Neuroleptic malignant syndrome is a rare but serious drug reaction most often linked to antipsychotic medications and other medicines that reduce dopamine activity. It...

Neurodevelopmental Disorder Overview: Types, Signs, and Complications

Clear overview of neurodevelopmental disorders, including common types, early and later signs, possible causes, risk factors, diagnostic context, lookalikes, and complications.

Neurodevelopmental disorders are conditions that begin during brain development and affect how a person learns, communicates, moves, pays attention, behaves, or manages daily demands....

Neurocognitive Disorder Signs, Risk Factors, and Diagnostic Context

A clear guide to neurocognitive disorder, including mild and major forms, early symptoms, common causes, risk factors, diagnostic context, look-alike conditions, and complications.

Neurocognitive disorder is a clinical term for cognitive decline that is significant enough to be noticed, measured, and connected to changes in daily thinking...

Neurobehavioral Disorder Signs, Risk Factors, and Diagnostic Context

Neurobehavioral disorder can describe brain-related changes in behavior, thinking, emotion, self-control, and daily functioning. Learn key symptoms, causes, risk factors, complications, diagnostic context, and warning signs that need prompt evaluation.

A neurobehavioral disorder is a brain-related condition or clinical pattern in which changes in behavior, emotions, thinking, attention, self-control, social functioning, or daily living...

Neurasthenia and Persistent Fatigue: Key Symptoms and Complications

Learn what neurasthenia means today, including symptoms, signs, causes, risk factors, diagnostic context, related conditions, and warning signs that need evaluation.

Neurasthenia is an older diagnostic term for a pattern of persistent exhaustion, reduced mental or physical stamina, and distressing body symptoms such as headaches,...

Negative Symptom Schizophrenia: Overview of Core Symptoms and Functional Effects

Negative symptoms in schizophrenia can involve reduced motivation, speech, emotional expression, pleasure, and social interest. Learn how these signs differ from depression, positive symptoms, and cognitive changes, and when professional evaluation may matter.

Negative symptoms are among the most important but often least understood parts of schizophrenia. They describe a reduction or loss of normal emotional expression,...

Narcolepsy Overview: Symptoms, Cataplexy, Causes, and Risks

Learn what narcolepsy is, how its symptoms can appear, what causes and risk factors are known, which conditions can mimic it, and when professional evaluation may matter.

Narcolepsy is a chronic neurological sleep-wake disorder that causes the brain to have trouble regulating alertness, sleep, and rapid eye movement sleep. The result...

Narcissistic Personality Disorder Signs, Symptoms, and Clinical Features

A clear guide to narcissistic personality disorder, including core symptoms, grandiose and vulnerable signs, likely causes, diagnostic context, look-alike conditions, and possible complications.

Narcissistic personality disorder is a mental health condition involving a long-standing pattern of unstable self-esteem, exaggerated self-importance, need for admiration, and difficulty recognizing or...

Myxedema Psychosis and Severe Hypothyroidism: Symptoms, Risks, and Diagnostic Context

Learn how myxedema psychosis can occur with severe hypothyroidism, what symptoms and physical signs may appear, what it can be confused with, and when urgent evaluation may matter.

Myxedema psychosis is a rare psychiatric presentation of severe hypothyroidism, which means the body has too little thyroid hormone for normal brain and body...

Myoclonus Symptoms, Signs, Causes, Risk Factors, and Complications

Clear overview of myoclonus, including sudden jerks, twitching, positive and negative myoclonus, common causes, risk factors, complications, look-alike symptoms, and when evaluation may be urgent.

Myoclonus refers to sudden, brief, involuntary jerks or twitches of a muscle or group of muscles. Some forms are common and harmless, such as...

Mutism Explained: Types, Signs, Causes, and Risks

Learn what mutism means, how symptoms and signs can appear, what conditions may cause it, and when sudden or severe loss of speech needs professional evaluation.

Mutism means a person is not speaking, but the reason can vary widely. In some people, mutism is a pattern of not speaking in...

Muscle Dysmorphia Signs and How It Differs From Fitness Goals

A clear guide to muscle dysmorphia, including how it differs from fitness goals, the signs to watch for, common risk factors, possible complications, and when evaluation may be important.

Muscle dysmorphia is a mental health condition in which a person becomes intensely preoccupied with the idea that their body is too small, not...

Munchausen Syndrome Signs, Symptoms, and Health Risks

Understand Munchausen syndrome, now often called factitious disorder imposed on self, including key symptoms, warning signs, causes, risk factors, diagnostic context, and serious complications.

Munchausen syndrome is a serious mental health condition in which a person falsifies, exaggerates, or deliberately creates illness in themselves without an obvious external...

Munchausen Syndrome by Proxy: Overview, Warning Signs, Causes, and Complications

Learn what Munchausen syndrome by proxy means, how factitious disorder imposed on another may appear, which warning signs matter, and why urgent professional evaluation can be necessary.

Munchausen syndrome by proxy is a serious and often difficult-to-recognize form of abuse in which a caregiver falsifies, exaggerates, or causes illness in another...

Morgellons Syndrome Signs, Similar Conditions, and Complications

Understand Morgellons syndrome, including common skin sensations, fiber concerns, possible causes, risk factors, diagnostic context, and safety concerns.

Morgellons syndrome is a highly distressing condition in which a person experiences unusual skin sensations, persistent sores or lesions, and a belief that fibers,...

Moral Insanity Explained: Historical Meaning and Modern Diagnosis

A clear guide to moral insanity as an outdated psychiatric term, including its historical meaning, modern diagnostic context, possible behavioral patterns, risk factors, warning signs, and complications.

“Moral insanity” is a historical psychiatric term, not a diagnosis used in modern mental health classification. In the 1800s, it was used to describe...

Mood Dysregulation Disorder in Children and Teens: Overview and Warning Signs

Mood dysregulation disorder in children involves persistent irritability and severe outbursts that can affect home, school, and relationships. Learn the main symptoms, causes, risks, diagnostic context, and complications.

Mood dysregulation disorder usually refers to disruptive mood dysregulation disorder, often shortened to DMDD. It is a childhood and adolescent mental health condition marked...

Mood Disorder Signs, Types, Causes, and Complications

Mood disorders can involve depression, mania, hypomania, irritability, sleep changes, impaired functioning, and safety risks. Learn the main types, signs, causes, risk factors, diagnostic context, and complications.

A mood disorder is a mental health condition in which changes in mood are more intense, persistent, impairing, or medically significant than ordinary emotional...

Mood Disorder Not Otherwise Specified Mood Symptoms, Causes, and Risks

Understand what mood disorder NOS means, how the older label relates to current diagnostic terms, which symptoms may appear, what conditions it can resemble, and when evaluation may be urgent.

Mood disorder not otherwise specified, often shortened to mood disorder NOS, is an older diagnostic term that may still appear in medical records, insurance...