Patients & CaregiversHealthcare ProfessionalsWorldwide
HomeAbout MerckProductsNewsroomInvestor RelationsCareersResearchLicensingThe Merck Manuals
THE MERCK MANUAL MEDICAL LIBRARY: The Merck Manual of Medical Information--Home Edition
Tips for better results
ABCDEFGHI
JKLMNOPQR
STUVWXYZ
Sections
Resources
Index
hahchdhehihlhmhohthuhy
Type in the first few letters of a word to get there faster:
Go

Hy

Hyaluronate injection

Osteoarthritis (OA): Treatment

Hydatid disease (echinococcosis)

Parasitic Infections
Other ParasitesTables

Hydatidiform mole

Hydatidiform Mole

Hydranencephaly

Other Birth DefectsTables

Hydrocarbon poisoning

Hydrocarbon Poisoning

Hydrocele

Hydrocele

Hydrocephalus

Brain Tumors: Treatment and Prognosis
Understanding Tumor TreatmentSidebar

  • brain tumor and

  • Brain Tumors: Symptoms

  • congenital

  • Brain and Spinal Cord Defects: Hydrocephalus

  • normal-pressure

  • Dementia: Other Dementias

  • subarachnoid hemorrhage and

  • Hemorrhagic Stroke: Symptoms

    Hydrochloric acid, in stomach

    Stomach

    Hydrocolloid dressings

    Treatment: Protective Agents
    Pressure Sores: Treatment

    Hydrocortisone

  • in Addison's disease

  • Addison's Disease: Treatment

  • in fungal infection

  • Ringworm: Treatment

  • in itching

  • Itching: Treatment

  • in proctitis

  • Proctitis: Treatment

  • in skin disorders

  • Treatment: Anti-inflammatory Agents

    Hydrofluoric acid

    Gas and Chemical Exposure: Symptoms and Diagnosis

    Hydrogen peroxide, in trench mouth

    Trench Mouth (ANUG)

    Hydrogen sulfide

    Gas and Chemical Exposure

    Hydromorphone

    Opioid AnalgesicsTables

    Hydronephrosis

    Acute Kidney Failure: Symptoms
    Hydronephrosis
    Hydronephrosis: A Distended KidneyFigures

    Hydrophobia (rabies)

    Viral Infections: Rabies
    Who Should Receive a Rabies Vaccine?Sidebar

    Hydrops

    see Swelling (edema)

    Hydrops fetalis

    Erythema Infectiosum

    Hydroquinone cream

    Vitiligo: Treatment

    Hydrostatic (underwater) weighing

    Fat Versus Lean: Body CompositionSidebar

    Hydrotherapy

    Types of Heat TherapyTables

    Hydroxyapatite

    Bones

    Hydroxychloroquine

  • in porphyria

  • Porphyria Cutanea Tarda: Treatment

  • in rheumatoid arthritis

  • Drugs Used to Treat Rheumatoid ArthritisTables
    Rheumatoid Arthritis (RA): Slow-Acting Drugs

    5-Hydroxyindoleacetic acid (5-HIAA)

    Carcinoid Tumors: Diagnosis

    Hydroxymethylbilane synthase deficiency (acute intermittent porphyria)

    Acute Intermittent Porphyria

    5-Hydroxytryptamine (5-HT, triptans)

    Migraines: Prevention and Treatment
    Drugs Used to Treat MigrainesTables

    Hydroxyurea

  • in polycythemia

  • Polycythemia Vera: Prognosis and Treatment

  • in sickle cell disease

  • Sickle Cell Disease: Treatment and Prevention

  • in thrombocythemia

  • Thrombocythemia: Treatment

    Hydroxyzine

    Some AntihistaminesTables

  • in elderly persons

  • Some Drugs With Increased Risk for Older People Tables

  • in physical allergy

  • Physical Allergy: Diagnosis and Treatment

    Hymen

    External Female Genital OrgansFigures
    Internal Genital Organs

    Hymenolepsis nana infection

    Other ParasitesTables

    Hyoscyamine

    Some Drugs Used to Treat Urinary IncontinenceTables

    Hyoscyamine, in elderly persons

    Some Drugs With Increased Risk for Older People Tables

    Hypacusis

    Hearing Loss and Deafness: Diagnosis

    Hyperactivity, in children

    Attention Deficit/Hyperactivity Disorder (ADD, ADHD)
    Signs of ADHDSidebar
    ADHD: Epidemic or Over-Diagnosis?Sidebar

  • in physical allergy

  • information resources on

  • Ag - Au

    Hyperaldosteronism

    Hyperaldosteronism
    Eating Real LicoriceSidebar

    Hyperbaric oxygen therapy

    Barotrauma: Prevention and Treatment

  • in altitude illness

  • Altitude Illness: Treatment

  • in decompression sickness

  • Decompression Sickness: Diagnosis and Treatment

    Hyperbilirubinemia

    see also Jaundice
    Hyperbilirubinemia

    Hypercalcemia

    Calcium: Hypercalcemia
    What Is Hyperparathyroidism?Sidebar

  • in cancer

  • What Are Paraneoplastic Syndromes?Sidebar

  • constipation in

  • Symptoms: Slowed Transit of Stool

  • in multiple myeloma

  • Multiple Myeloma: Symptoms and Complications

  • in Paget's disease of bone

  • Paget's Disease of Bone: Complications
    Paget's Disease of Bone: Treatment

  • in sarcoidosis

  • Sarcoidosis: Symptoms

  • in vitamin D excess

  • Vitamin D: Vitamin D Excess

    Hypercalciuria

    Stones in the Urinary Tract: Prevention

    Hypercholesterolemia

    see Cholesterol, high blood levels of

    Hyperchylomicronemia

    Hyperlipoproteinemia: Hereditary Hyperlipoproteinemias

    Hyperemesis gravidarum

    Risk Factors That Develop During Pregnancy: Hyperemesis Gravidarum

    Hypereosinophilic syndrome

    Eosinophilic Disorders

    Hyperglycemia

    see also Diabetes mellitus

  • coma with

  • Some Causes of Stupor and Coma Tables

  • in premature infant

  • Prematurity: Abnormal Blood Sugar

    Hyperhidrosis

    Excessive Sweating
    Some Causes of Excessive SweatingTables

    Hyperhomocysteinemia

    Thrombophilia: Causes
    Thrombophilia: Diagnosis and Treatment

  • atherosclerosis and

  • Atherosclerosis: High Blood Levels of Homocysteine (Hyperhomocysteinemia)

    Hyperimmunoglobulinemia E syndrome

    Hyperimmunoglobulinemia E Syndrome

    Hyperinsulinemia

    Obesity: Causes

    Hyperkalemia

    Potassium: Hyperkalemia

  • in kidney failure

  • Chronic Kidney Failure: Diagnosis
    Chronic Kidney Failure: Treatment

  • periodic paralysis with

  • Periodic Paralysis

    Hyperlipoproteinemia (hyperlipidemia)

    Hyperlipoproteinemia
    Metabolic Syndrome: A Cluster of ProblemsSidebar
    A Practical Approach to a Low-Cholesterol, Low-Saturated Fat Diet Tables
    Lipid-Lowering DrugsTables

  • hereditary

  • Hyperlipoproteinemia: Hereditary Hyperlipoproteinemias

    Hypermagnesemia

    Magnesium: Hypermagnesemia

    Hypernatremia

    Sodium: Hypernatremia

  • coma with

  • Some Causes of Stupor and Coma Tables

    Hyperopia (farsightedness)

    Symptoms: Refractive Error
    Understanding RefractionFigures
    Refractive Disorders: Causes

  • in children

  • Refractive Errors in ChildrenSidebar

    Hyperosmia

    Smell and Taste Disorders: Smell

    Hyperparathyroidism

    Calcium: Hypercalcemia
    What Is Hyperparathyroidism?Sidebar
    Multiple Endocrine Neoplasia Syndromes: Type 1 Disease
    Multiple Endocrine Neoplasia Syndromes: Type 2A Disease

    Hyperphosphatemia

    Phosphate: Hyperphosphatemia

  • in kidney failure

  • Chronic Kidney Failure: Treatment

    Hyperproteinemia, idiopathic (intestinal lymphangiectasia)

    Intestinal Lymphangiectasia

    Hypersensitivity

    see Allergy and allergic reactions

    Hypersensitivity pneumonitis

    Who Is at Risk for Occupational Lung Diseases?Sidebar
    Hypersensitivity Pneumonitis
    What Causes Hypersensitivity Pneumonitis? Tables

    Hypersensitivity vasculitis

    Selected Disorders Characterized by Vasculitis Tables

    Hypersomnia

    Hypersomnia

    Hypersplenism

    Enlarged Spleen

    Hypertension

    see also High blood pressure
    High Blood Pressure

  • classification of

  • Classifying Blood Pressure in Adults Tables

  • intracranial

  • What Is Pseudotumor Cerebri?Sidebar
    Papilledema

  • malignant

  • High Blood Pressure
    High Blood Pressure: Symptoms
    High Blood Pressure: Treatment of Hypertensive Urgencies and Emergencies

  • kidney failure in

  • Malignant Hypertensive Nephrosclerosis

  • portal

  • Portal Hypertension

  • pulmonary

  • Heart Failure: Systolic Dysfunction
    Pulmonary Hypertension
    Cor Pulmonale: A Disorder Stemming From Pulmonary HypertensionSidebar

  • in newborn

  • Persistent Pulmonary Hypertension

  • pregnancy and

  • Risk Factors Present Before Pregnancy: Heart Disease

  • renovascular

  • Occlusive Peripheral Arterial Disease: Renal Arteries

  • secondary

  • High Blood Pressure: Treatment of Secondary Hypertension

  • white coat

  • High Blood Pressure: Aggravating Factors

    Hyperthermia, malignant

    Genetic Makeup

    Hyperthyroidism

    Iodine: Iodine Excess
    Hyperthyroidism
    Drugs Used to Treat HyperthyroidismTables
    Thyroid StormSidebar

  • after childbirth

  • Thyroid Disorders

  • apathetic

  • Hyperthyroidism: Symptoms

  • arrhythmias in

  • Abnormal Heart Rhythms: Causes

  • in elderly persons

  • Disorders in Older People

  • heart failure with

  • Heart Failure: Systolic Dysfunction

  • masked

  • Hyperthyroidism: Symptoms

  • in newborn

  • Thyroid Disorders: Hyperthyroidism

  • over-the-counter drug precautions in

  • Chronic Disorders and Over-the-Counter Drugs Tables

  • during pregnancy

  • Physical Changes: Hormones

  • in thyroiditis

  • Thyroiditis: Subacute Painless Thyroiditis

    Hypertriglyceridemia

    see Triglycerides, high blood levels

    Hypertrophic osteoarthropathy

    What Are Paraneoplastic Syndromes?Sidebar

    Hypertrophic pyloric stenosis

    Feeding Problems: Vomiting
    Hypertrophic Pyloric Stenosis

    Hyperuricemia

    Gout
    Risk Factors for the Development of GoutSidebar
    Drugs Used to Treat GoutTables

    Hyperventilation

  • alkalosis with

  • Alkalosis

  • in diver

  • Breathing Air Under High PressureSidebar

    Hyperventilation syncope

    Fainting: Other Problems

    Hyperventilation syndrome

    Symptoms: Other Causes

    Hyperviscosity syndrome

    Macroglobulinemia: Symptoms and Complications

    Hyphema

    Blunt Injuries to the Eye: Hyphema

    Hypnosis

    Types of Alternative Medicine: Hypnotherapy

  • in conversion disorder

  • Conversion Disorder: Treatment

  • in dissociative amnesia

  • Dissociative Amnesia: Treatment and Prognosis

  • in dissociative identity disorder

  • Dissociative Identity Disorder: Diagnosis

  • for pain

  • Treatment: Nondrug Pain Treatments

    Hypoalphalipoproteinemia

    Hypolipoproteinemia

    Hypobetalipoproteinemia

    Hypolipoproteinemia

    Hypocalcemia

    Calcium: Hypocalcemia
    Calcium: Hypocalcemia

  • in DiGeorge anomaly

  • DiGeorge Anomaly

    Hypochondriasis

    Hypochondriasis
    Common Coping Mechanisms Tables

  • in children

  • Somatoform Disorders

    Hypogammaglobulinemia, in infants

    Transient Hypogammaglobulinemia of Infancy

    Hypogeusia

    Smell and Taste Disorders: Taste

    Hypoglossal nerve

    Testing Cranial Nerves Tables
    Hypoglossal Nerve Disorders

    Hypoglycemia

    Diabetes Mellitus (DM): Treatment
    Hypoglycemia

  • in children

  • Diabetes Mellitus (DM): Complications of Treatment and Illness

  • coma with

  • Some Causes of Stupor and Coma Tables

  • in large-for-gestational-age infant

  • Large for Gestational Age (LGA)

  • in pancreatitis

  • Chronic Pancreatitis: Treatment

  • in postmature newborn

  • Postmaturity: Symptoms

  • in premature infant

  • Prematurity: Abnormal Blood Sugar

    Hypohidrosis

    Diminished Sweating

    Hypokalemia

    see also Potassium, low blood levels of
    Potassium: Hypokalemia

    Hypolipoproteinemia

    Hypolipoproteinemia

    Hypomagnesemia

    Magnesium: Hypomagnesemia

  • low calcium levels and

  • Calcium: Hypocalcemia

    Hypomania

    Mania
    Physical Disorders That Can Cause ManiaSidebar

    Hypomenorrhea

    Deciphering Medical Terms for Menstrual DisordersTables

    Hyponatremia

    Sodium: Hyponatremia

  • coma with

  • Some Causes of Stupor and Coma Tables

  • in gastroenteritis

  • Gastroenteritis: Symptoms

    Hypopharynx

    A Look Inside the Nose and ThroatFigures
    Throat

    Hypophosphatemia

    Phosphate: Hypophosphatemia

  • rickets and

  • Hypophosphatemic Rickets

    Hypopituitarism

    Hypopituitarism
    What Causes an Underactive Pituitary?Sidebar

    Hypoplastic left heart syndrome

    Other Birth DefectsTables

    Hyposmia

    Smell and Taste Disorders

    Hypospadias

    Urinary Tract Defects: Bladder and Urethra Defects

    Hypotension

    see also Low blood pressure
    Low Blood Pressure

  • orthostatic

  • Physical Therapy (PT): Tilt Table
    Symptoms: Causes

  • in anemia

  • Anemia From Excessive Bleeding: Symptoms and Diagnosis

  • in dehydration

  • Dehydration

  • dizziness and

  • Dizziness: Diagnosis

  • idiopathic

  • Pure Autonomic Failure

  • in multiple system atrophy

  • Multiple System Atrophy: Symptoms
    Multiple System Atrophy: Treatment

  • postprandial

  • Postprandial Hypotension

    Hypothalamic-pituitary axis

    Endocrine Controls

    Hypothalamus

    Brain: Cerebrum
    Major Endocrine GlandsFigures

  • in body temperature regulation

  • Defenses Against Infection: Fever

  • in female reproductive function

  • Biology of the Female Reproductive System

  • in hormone control

  • Endocrine Controls
    Adrenal Gland Disorders

    Hypothermia

    Hypothermia

  • coma with

  • Some Causes of Stupor and Coma Tables

    Hypothyroidism

    Hypopituitarism: Thyroid-stimulating Hormone Deficiency
    Hypopituitarism: Diagnosis
    Hypothyroidism

  • after childbirth

  • Thyroid Disorders

  • after thyroid removal

  • Hyperthyroidism: Prognosis and Treatment

  • arrhythmias in

  • Abnormal Heart Rhythms: Causes

  • cholesterol levels in

  • Hyperlipoproteinemia

  • constipation in

  • Symptoms: Slowed Transit of Stool

  • in elderly persons

  • Disorders in Older People

  • heart failure with

  • Heart Failure: Systolic Dysfunction

  • in newborn

  • Thyroid Disorders: Hypothyroidism