Diseases & conditions A-Z List
Diseases & Conditions A-Z List - «H»:
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Heroin overdose
Heroin is an illegal street drug that is is very addictive. This article discusses overdose due to heroin. An overdose is when you take more than the normal or recommended amount of something, usually a drug. An overdose may result in serious, harmful symptoms or death.
This is for information only ...
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Herpangina
Herpangina is a viral illness in which ulcers and sores (lesions) form inside the mouth, and there is a sore throat and fever.
See also: Hand, foot, and mouth disease
Causes
Herpangina is typically caused by Coxsackie group A viruses.
The number of cases of herpangina is unknown, but it is a commo...
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Herpes - resources
The following organizations are good resources for information on genital herpes:
American Social Health Association - www.ashastd.org
U.S. Centers for Disease Control and Prevention - www.cdc.gov/std/herpes/STDFact-herpes.htm
Alternative Names
Genital herpes - resources; Resources - genital he...
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Herpes esophagitis
Herpes esophagitis is a viral infection that involves inflammation and ulcers in the esophagus, the tube that carries food from the mouth to the stomach.
Causes
The herpes simplex virus causes herpes esophagitis.
Infection of the esophagus by the herpes simplex virus is rare in people with normal i...
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Herpes labialis
Herpes labialis is infection of the lips, mouth, or gums with the herpes simplex virus. It leads to the development of small, painful blisters commonly called cold sores or fever blisters.
Causes
Herpes labialis is a common disease caused by infection of the mouth area with herpes simplex virus typ...
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Herpes simplex
Herpes simplex is a viral infection that mainly affects the mouth or genital area.
Causes
There are two strains of herpes simplex viruses:
Herpes simplex virus type 1 (HSV-1) is usually associated with infections of the lips, mouth, and face. It is the most common herpes simplex virus and many pe...
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Herpes viral culture of lesion
Herpes viral culture of a lesion is a laboratory test to check if a skin sample is infected with the herpes simplex virus.
See also:
Genital herpes
Herpes labialis (cold sores)
Serum herpes simplex antibodies
How the Test is Performed
A sample from a skin lesion (often a genital sore) or bl...
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Herpetic stomatitis
Herpetic stomatitis is a viral infection of the mouth that causes ulcers and inflammation. These mouth ulcers are not the same as canker sores, which are caused by a different virus.
Causes
Herpetic stomatitis is a contagious viral illness caused by Herpes virus hominis (also herpes simplex virus, ...
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Heterochromia
Heterochromia is the presence of different colored eyes in the same person.
Considerations
Heterochromia is uncommon in humans, but quite common in dogs (such as Dalmatians and Australian sheep dogs), cats, and horses.
Causes
Most cases of heterochromia are hereditary, caused by a disease or ...
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Hiatal hernia
Hiatal hernia is a condition in which a portion of the stomach protrudes upward into the chest, through an opening in the diaphragm. The diaphragm is the sheet of muscle that separates the chest from the abdomen. It is used in breathing.
Causes
The cause is unknown, but hiatal hernias may be the re...
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Hib - vaccine
The HiB vaccine (immunization) prevents childhood Haemophilus influenzae B infections, which can cause severe and potentially deady illnesses that affect the brain, lungs, and bones or joints.
Information
WHO SHOULD GET THIS VACCINE
The Hib vaccine is one of the recommended childhood immunizations....
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Hiccups
A hiccup is an unintentional movement (spasm) of the diaphragm, the muscle at the base of the lungs. The spasm is followed by quick closing of the vocal cords, which produces a distinctive sound.
Considerations
Hiccups often start for no apparent reason and usually disappear after a few minutes. Ra...
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High arch
High arch is an excessively raised arch (also called instep) on the bottom of the foot. The arch runs from the toes to the heel. It is also called pes cavus.
High arch is the opposite of flat feet.
Causes
High foot arches are much less common than flat feet. However, they are more likely to be asso...
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High blood cholesterol and triglycerides
The medical term for high blood cholesterol and triglycerides is lipid disorder. Such a disorder occurs when you have too many fatty substances in your blood. These substances include cholesterol and triglycerides.
Causes
A lipid disorder increases your risk for atherosclerosis, and thus for heart ...
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High blood pressure - infants
High blood pressure (hypertension) is an increase in the force of blood against the arteries in the body. This article focuses on high blood pressure in infants.
Causes
Blood pressure measures how hard the heart is working, and how healthy the arteries are. There are two numbers in each blood press...
