Evidence-Based Supplement & Herb Guides

Illness Anxiety Disorder Symptoms, Signs, Causes, and Complications

A clear guide to illness anxiety disorder, including symptoms, signs, causes, risk factors, diagnostic context, related conditions, and possible complications.

Illness anxiety disorder is a mental health condition in which fear of having or developing a serious illness becomes persistent, distressing, and hard to...

Identity disorder: Overview, Symptoms, Signs, Causes, Risk Factors, and Complications

Learn what identity disorder can mean, how identity disturbance differs from dissociative identity disorder, which symptoms matter most, and when professional evaluation is important.

Identity problems can be confusing because the word “identity” is used in several different ways in mental health. Some people mean a persistent uncertainty...

Hysteria Symptoms, Signs, Causes, and Modern Clinical Meaning

Understand why hysteria is no longer used as a diagnosis, what symptoms it once described, which modern conditions may overlap, and when professional evaluation matters.

“Hysteria” is an old medical term that is no longer used as a formal diagnosis in modern psychiatry or neurology. In the past, it...

Hypomanic episode Overview: How to Recognize Symptoms and Risks

Learn what a hypomanic episode looks like, how it differs from mania and normal high energy, what can trigger it, and when professional evaluation may be important.

A hypomanic episode is a period of unusually elevated, expansive, or irritable mood with noticeably increased energy or activity. It is more than simply...

Hypomania Symptoms, Signs, Causes, and Risk Factors

Clear, practical guide to hypomania symptoms, signs, causes, risk factors, complications, and how clinicians distinguish it from mania, ADHD, anxiety, substance effects, and normal high energy.

Hypomania is a distinct change in mood, energy, activity, and behavior that is noticeable to others but not as severe as mania. It can...

Hypokinetic mutism signs: how it differs from coma, catatonia, and locked-in syndrome

Learn what hypokinetic mutism means, how it appears, what conditions it can resemble, and why sudden reduced speech or movement may require medical evaluation.

Hypokinetic mutism describes a state in which a person is awake but shows a profound reduction in spontaneous movement and speech. In much of...

Hypochondriasis Symptoms, Signs, Causes, and Complications

Clear overview of hypochondriasis, including modern diagnostic terms, symptoms, behavioral signs, causes, risk factors, related conditions, complications, and when evaluation may matter.

Hypochondriasis describes a persistent, distressing fear of having or developing a serious illness, even when medical evaluation does not support that fear. Many clinicians...

Hypoactive Sexual Desire Disorder Symptoms, Causes, and Diagnostic Context

Understand hypoactive sexual desire disorder, including how it differs from normal low libido, common symptoms, possible causes, risk factors, complications, and when evaluation may be important.

Hypoactive sexual desire disorder describes a persistent, distressing reduction or absence of sexual desire. It is not the same as having a naturally low...

Hypnopompic Hallucinations: How They Differ From Nightmares and Psychosis

Learn what hypnopompic hallucinations feel like, why they happen during waking, what they can be confused with, and when symptoms may need professional evaluation.

Hypnopompic hallucinations are vivid sensory experiences that happen while a person is waking up. They can look, sound, or feel strikingly real, even though...

Hypnagogic Hallucinations Symptoms, Causes, Signs, and Risk Factors

Hypnagogic hallucinations are vivid sleep-onset experiences that can involve sights, sounds, body sensations, or a sensed presence. Learn how they differ from dreams, nightmares, sleep paralysis, narcolepsy symptoms, and waking hallucinations, plus when evaluation may be important.

Hypnagogic hallucinations are vivid sensory experiences that happen as a person is falling asleep. They can involve seeing shapes, faces, animals, people, lights, or...

Hypervigilance Signs and Symptoms in Trauma, Anxiety, and Stress

Hypervigilance is a persistent state of threat monitoring that can affect sleep, concentration, relationships, and daily functioning. Learn the symptoms, causes, risk factors, complications, and diagnostic context.

Hypervigilance is a state of heightened watchfulness in which the mind and body stay on alert for possible danger, even when the immediate situation...

Hyperthymia Explained: Signs, Causes, and Diagnostic Context

Hyperthymia is a persistent high-energy temperament that can be adaptive or impairing. Learn how it differs from hypomania, what signs matter, and when symptoms may signal a broader mood disorder.

Hyperthymia usually refers to hyperthymic temperament: a long-standing pattern of unusually high energy, optimism, confidence, sociability, and drive. It is not the same as...

Hypersomnia: Causes, Signs, and Multimodal Treatment Strategies for Deep Sleep Needs

Learn what hypersomnia means, how symptoms differ from fatigue, what conditions can cause excessive sleepiness, and when safety concerns need prompt evaluation.

Hypersomnia, or excessive daytime sleepiness, can leave you feeling drained no matter how much rest you get at night. Unlike the occasional mid-afternoon slump,...

Hypersexual Disorder Symptoms, Signs, Causes, and Complications

Learn what hypersexual disorder means, how symptoms and warning signs may appear, what risk factors can contribute, and when compulsive sexual behavior raises safety concerns.

Sexual desire varies widely from person to person, and frequent sexual thoughts or behaviors are not automatically a mental health disorder. Concern usually begins...

Hyperresponsivity disorder: What It Means and How It Can Affect Daily Life

Understand hyperresponsivity disorder, including sensory over-responsivity symptoms, signs across age groups, possible causes, risk factors, diagnostic context, and complications.

Hyperresponsivity disorder is best understood as a pattern of unusually strong reactions to ordinary sensory, emotional, or environmental input. In everyday life, this may...

Hyperreligiosity Overview: When Religious Preoccupation Becomes Clinically Concerning

Hyperreligiosity is an intense or excessive religious preoccupation that may appear with psychosis, mania, seizures, dementia, substances, or severe mood symptoms. Learn how clinicians distinguish faith from clinically concerning signs, causes, risks, and complications.

Hyperreligiosity means an unusually intense, excessive, or clinically concerning focus on religious or spiritual ideas, practices, identity, guilt, prophecy, morality, or divine meaning. It...