Hashimoto's thyroiditis

Hay Fever

Head Lice

Headache
Cluster headache
Migraine headache
Sinus headache
Tension headache

Head trauma

Hearing
Impairment
Loss

Heart attack

Heart block

Heart disease

Heart murmur

Heartburn

Heat exhaustion

Heat stroke

Helicobacter pylori Infections

Hemangioma

Hematuria

Hemifacial spasm

Hemochromatosis

Hemolytic anemia

Hemophilia

Hemorrhoids

Hendra Virus Disease

Henoch-Schonlein purpura

Hepatic coma

Hepatic encephalopathy

Hepatitis
Hepatitis A
Hepatitis B
Hepatitis C
Hepatitis D
Hepatitis E
Hepatitis - toxic

Hepatoma, malignant

Hereditary dystopic lipidosis

Hereditary motor and sensory neuropathies (HMSNs)

Hernia
Groin (inguinal) hernia
Hiatal hernia

Herniated disk

Herpes simplex 1

Herpes simplex 2

Herpes zoster

Heterophyes heterophyes

Heterophyiasis

Hiatal hernia

HIB Infection

Hiccups

Hidradenitis supporativa

High blood pressure

High cholesterol

High triglycerides

Hip dislocation

Hip fracture

Hirschprung-Galant infantilism

Hirschsprung's disease

Hirsutism

Histiocytoma

Histoplasmosis

HIV (AIDS, HIV Disease)

Hives

Hodgkin's disease (Hodgkin's lymphoma)

Homocystinuria

Hookworm Infection

Hordeolum

Hot Tub Rash

HPV Infection

Human mad cow disease

Human papillomavirus (HPV)

Human Parainfluenza Virus Infections (HPIV)

Huntington's disease (Huntington's chorea)

Hyaline membrane disease

Hydrocele/Varicocele

Hydrocephalus

Hydronephrosis

Hymenolepis Infection

Hyperbilirubinemia

Hypercholesterolemia

Hypercortisolism

Hyperemesis gravidarum

Hyperhidrosis

Hyperlipidemia

Hypermenorrhea

Hyperparathyroidism

Hyperopia

Hypertension

Hypertensive crisis

Hypertensive emergency

Hypertensive urgency

Hyperthyroidism

Hypertrophic scar

Hypoactive sexual desire

Hypochondria

Hypoferremia of inflammatory disease

Hypoglycemia

Hypoparathyroidism

Hypopituitarism

Hypotension, orthostatic

Hypothermia

Hypothyroidism

Hypoxanthine-guanine phosphoribosyltransferase deficiency (HPRT deficiency)