Use the A-Z list to browse more than 6,000 health-related topics in our library. Clicking on a term opens the definition and, in most cases, links to more information.
"GPC" is more commonly referred to as "Giant Papillary Conjunctivitis" in the medical community. Giant Papillary Conjunctivitis
A type of conjunctivitis associated with wearing contact lens, causing mild itching, blurred vision and light sensitivity, among other symptoms. GPC may be caused by irritation or by an allergic reaction to the buildup of proteins on the lens. More Information on Giant Papillary Conjunctivitis: Eye Conditions
A surgical technique that repairs damaged sphincter muscles by taking muscle from the inner thigh and wrapping it around the sphincter. More Information on Gracilis Muscle Transplant: Anal & Rectal Disorders
An electrocardiogram performed while the patient exercises in a controlled manner on a treadmill or stationary bicycle at varied speeds and elevations. This test can help detect heart irregularities, disease and damage. More Information on Stress Test: Heart Imaging & Rhythm Tests
"Grades of Cancer" is more commonly referred to as "Stages of Cancer" in the medical community. Stages of Cancer
Also Known As: "Cancer Grades, Cancer Staging System, Cancer Grading, Cancer Stages, Cancer Grading System, Cancer Staging"
A determination of whether a cancer is contained in the place where it first developed or has spread (and, if so, how far it has spread). More Information on Stages of Cancer: Cancer Basics
The replacement of missing or thin tissue with tissue of a similar sort, with the intent for the natural tissue to regenerate and incorporate the introduced tissue. It can be used with soft tissue, such as the gums, or harder bone tissue. More Information on Graft: Oral Infections
Grain-based foods such as breads, rice, cereals and pastas. They are good sources of carbohydrates, vitamins, minerals and fibers. They are the foundation of a healthy diet and are found at the base of the USDA food pyramid. More Information on Grains: Carbs & Sugars
"Grand Mal Seizures" is more commonly referred to as "Tonic Clonic Seizures" in the medical community. Tonic Clonic Seizures
Also Known As: "Convulsions"
A type of generalized seizure that involves stiffening of the limbs (tonic phase) followed by jerking of the limbs and face (clonic phase). Some people may have only one of these phases. More Information on Tonic Clonic Seizures: Epilepsy & Seizure
"Granulamotous Arteritis" is more commonly referred to as "Temporal Arteritis" in the medical community. Temporal Arteritis
Also Known As: "Cranial Arteritis, Giant Cell Arteritis, Horton's Disease"
A chronic vascular disease of unknown origin in the elderly, often associated with polymyalgia rheumatica. The arteries narrow, reducing blood flow in the affected areas. It may cause persistent headaches and vision loss. More Information on Temporal Arteritis: Ear, Eye & Face Pain
"Granulocytic Sarcoma" is more commonly referred to as "Chloroma" in the medical community. Chloroma
Cancerous, green-colored tumor of myeloid cells (a type of immature white blood cell). Usually associated with myelogenous leukemia. More Information on Chloroma: Leukemia & Bone Cancer
Small area of inflammatory tissue in the body due to tissue injury, such as from infection. It may occur in the lungs, gastrointestinal tract or elsewhere. While noncancerous, it may resemble cancer in x-rays. More Information on Granuloma: Skin Related Infections
Also Known As: "Generalized GA, GA, Generalized Granuloma Annulare"
A symmetrical rash made up of skin-colored bumps. It appears over knuckles and other joints or in places subject to frequent, mild injury such as the back of the hands or top of the feet. In most cases, no treatment is required. More Information on Granuloma Annulare: Skin Growths
"Granulomatous Inflammation" is more commonly referred to as "Inflammation" in the medical community. Inflammation
Also Known As: "Proliferative Inflammation, Acute Inflammation, Hyperplastic Inflammation, Pseudomembranous Inflammation, Chronic Inflammation, Interstitial Inflammation, Purulent Inflammation"
A reaction that occurs in the body in response to injury or disease that includes redness, swelling, pain and heat. Many health problems cause inflammation to occur in one area or throughout the body. More Information on Inflammation: Pain Basics
"Grape Sugar" is more commonly referred to as "Dextrose" in the medical community. Dextrose
Also Known As: "Corn Sugar, D Glucose"
A form of glucose, a simple sugar that is the body's main source of energy. It is also given intravenously for hydration purposes. Dextrose occurs in sweet fruits and honey, and can also be made from starches, such as wheat or corn. More Information on Dextrose: Carbs & Sugars
"GRAS" is more commonly referred to as "Generally Recognized As Safe" in the medical community. Generally Recognized As Safe
Substances that have been deemed safe for consumption and for manufacturers to add to foods without experimental studies. In 1958, Congress developed a list for manufacturers of these substances. More Information on Generally Recognized As Safe: Nutrition Basics
Also Known As: "Toxic Diffuse Goiter, Diffuse Thyrotoxic Goiter"
An autoimmune disorder in which antibodies attack the thyroid gland, causing it to become overactive. The most common cause of hyperthyroidism, it also may damage tissue behind the eyes and affect skin, particularly on the lower legs. More Information on Graves' Disease: Thyroid & Parathyroid
Condition associated with Graves' disease in which tissues and muscles behind the eyes swell, causing the eyes to bulge. Severe cases may require surgery to correct double vision or return the eyes to their normal position. More Information on Graves' Ophthalmopathy: Thyroid & Parathyroid
The total number of pregnancies a woman has had, including the result of the pregnancy. A woman with a first pregnancy is called primigravida. A woman that has never been pregnant is nulligravida. More Information on Gravida: Pregnancy Basics
One of two main types of nervous system tissue that contains a high proportion of nerve cells (compared to white matter, which contains mostly axons). More Information on Gray Matter: Brain & Nerve Basics
"Great Arteries" is more commonly referred to as "Artery" in the medical community. Artery
Also Known As: "Great Vessels"
Except for the pulmonary artery, which carries oxygen-poor blood to the lungs, all arteries carry oxygen-rich blood away from the heart and toward other tissues throughout the body. More Information on Artery: Heart Basics
"Great Ragweed" is more commonly referred to as "Ragweed" in the medical community. Ragweed
Also Known As: "Ambrosia Artemisiifolia, Horse Ragweed, Common Ragweed, Ambrosia Trifida"
A common weedy plant that produces a pollen known to trigger hay fever and asthma. It grows alongside roads and rivers and in vacant lots. Flowers are yellowish-green. It is often confused with goldenrod, which can not trigger hay fever. More Information on Ragweed: Outdoor Allergies
"Great Vessels" is more commonly referred to as "Artery" in the medical community. Artery
Also Known As: "Great Arteries"
Except for the pulmonary artery, which carries oxygen-poor blood to the lungs, all arteries carry oxygen-rich blood away from the heart and toward other tissues throughout the body. More Information on Artery: Heart Basics
"Greater Vestibular Cyst" is more commonly referred to as "Bartholin Cyst" in the medical community. Bartholin Cyst
Lump caused by blockage of one of the Bartholin glands, which produce fluids that lubricate the opening to the vagina. These cysts often do not need treatment but sometimes need to be surgically removed or, if they become infected, to be drained. More Information on Bartholin Cyst: Vaginal & Cervical Health
"Greater Vestibular Glands" is more commonly referred to as "Bartholin Glands" in the medical community. Bartholin Glands
Two glands located below the opening of the vagina that produce fluids to provide lubrication. More Information on Bartholin Glands: Vaginal & Cervical Health
"Green Tea" is more commonly referred to as "Tea" in the medical community. Tea
Also Known As: "Herbal Tea, White Tea, Black Tea, Oolong Tea"
A beverage made with tea leaves and hot water. Four major types (black, oolong, green and white) come from the same plant but are processed differently. Some contain more antioxidants than others. Herbal teas are made from other plants or herbs. More Information on Tea: Functional Foods
Procedure that uses a form of black light to reduce skin inflammation. Developed in the 1920s, it is rarely used today and has been superseded by recent medical advances. However, it is sometimes still used when other treatments fail. More Information on Grenz Ray Therapy: Psoriasis & Autoimmune Skin
Procedure that uses a form of black light to reduce skin inflammation. Developed in the 1920s, it is rarely used today and has been superseded by recent medical advances. However, it is sometimes still used when other treatments fail. More Information on Grenz Rays: Psoriasis & Autoimmune Skin
"Grippe" is more commonly referred to as "Flu" in the medical community. Flu
Also Known As: "Influenza, Seasonal Flu"
An acute viral infection that affects the respiratory tract. Symptoms include coughing, sneezing, headache, fever and fatigue. More Information on Flu: Cold & Flu Basics
"Groin Hernia" is more commonly referred to as "Inguinal Hernia" in the medical community. Inguinal Hernia
A type of hernia involving the protrusion of the intestines into the groin. This is the most common type of hernia. More Information on Inguinal Hernia: Abdominal Pain
"Groin Muscle Sprain" is more commonly referred to as "Pulled Groin Muscle" in the medical community. Pulled Groin Muscle
Also Known As: "Groin Muscle Strain"
An injury to the muscles of the inner thigh that occurs when the muscles are stretched too far, or strained. The condition usually heals on its own with proper rest. More Information on Pulled Groin Muscle: Arm & Leg Pain
"Groin Muscle Strain" is more commonly referred to as "Pulled Groin Muscle" in the medical community. Pulled Groin Muscle
Also Known As: "Groin Muscle Sprain"
An injury to the muscles of the inner thigh that occurs when the muscles are stretched too far, or strained. The condition usually heals on its own with proper rest. More Information on Pulled Groin Muscle: Arm & Leg Pain
Also Known As: "GAS Infection, Invasive Group A Streptococcal Disease, Group A Streptococcus, Group A Streptococcal Infection"
A bacterium often found in the throat and on the skin that causes no symptoms of illness or relatively mild illnesses such as strep throat or impetigo. On rare occasions, severe and even life-threatening diseases may develop. More Information on Group A Strep Disease: Infectious Disease Basics
Also Known As: "GAS Infection, Group A Streptococcus, Group A Streptococcal Infection, Group A Strep Disease, Invasive Group A Streptococcal Disease"
A bacterium often found in the throat and on the skin that causes no symptoms of illness or relatively mild illnesses such as strep throat or impetigo. On rare occasions, severe and even life-threatening diseases may develop. More Information on Group A Streptococcal Disease: Infectious Disease Basics
Also Known As: "GAS Infection, Group A Strep Disease, Invasive Group A Streptococcal Disease, Group A Streptococcus"
A bacterium often found in the throat and on the skin that causes no symptoms of illness or relatively mild illnesses such as strep throat or impetigo. On rare occasions, severe and even life-threatening diseases may develop. More Information on Group A Streptococcal Infection: Infectious Disease Basics
Also Known As: "GAS Infection, Group A Streptococcal Infection, Group A Strep Disease, Invasive Group A Streptococcal Disease"
A bacterium often found in the throat and on the skin that causes no symptoms of illness or relatively mild illnesses such as strep throat or impetigo. On rare occasions, severe and even life-threatening diseases may develop. More Information on Group A Streptococcus: Infectious Disease Basics
Also Known As: "GBS Infection, Invasive Group B Streptococcal Disease, Group B Streptococcus, Group B Streptococcal Infection"
A common and usually harmless bacterial infection in adults. However, pregnant women can pass the infection to their babies during delivery, with severe consequences. As a result, testing for this infection is a routine part of prenatal care. More Information on Group B Strep Disease: Infectious Disease Basics
Also Known As: "GBS Infection, Group B Streptococcus, Group B Streptococcal Infection, Group B Strep Disease, Invasive Group B Streptococcal Disease"
A common and usually harmless bacterial infection in adults. However, pregnant women can pass the infection to their babies during delivery, with severe consequences. As a result, testing for this infection is a routine part of prenatal care. More Information on Group B Streptococcal Disease: Infectious Disease Basics
Also Known As: "GBS Infection, Group B Strep Disease, Invasive Group B Streptococcal Disease, Group B Streptococcus"
A common and usually harmless bacterial infection in adults. However, pregnant women can pass the infection to their babies during delivery, with severe consequences. As a result, testing for this infection is a routine part of prenatal care. More Information on Group B Streptococcal Infection: Infectious Disease Basics
Also Known As: "GBS Infection, Group B Streptococcal Infection, Group B Strep Disease, Invasive Group B Streptococcal Disease"
A common and usually harmless bacterial infection in adults. However, pregnant women can pass the infection to their babies during delivery, with severe consequences. As a result, testing for this infection is a routine part of prenatal care. More Information on Group B Streptococcus: Infectious Disease Basics
A form of psychotherapy involving multiple patients with a single therapist. All members of the group participate and analyze each other's problems under the guidance of the therapist. More Information on Group Therapy: Therapy & Support
Also Known As: "Transient Acantholytic Dermatosis"
Condition that appears suddenly as itchy red spots on the trunk, most often in older men. It is treated with prescription drugs or PUVA phototherapy. More Information on Grover Disease: Skin & Aging
Pain or tenderness in the muscles that may occur in young children or those entering puberty. They occur most frequently in active, athletic children and tend to ease with massage. More Information on Growing Pains: Growth & Development
Charts that track the weight, height and other measurements of children throughout the United States by age and gender. They are used as a reference to compare the growth of one child to others. More Information on Growth Charts: Growth & Development
Any substance in the body that promotes growth, especially cellular growth. These may be produced by the body or introduced into the body through diet. They are an experimental treatment for some cancers and blood conditions. More Information on Growth Factors: Cancer Drug & Medication
"Growth Failure-Pericardial Constriction Syndrome" is more commonly referred to as "Mulibrey Nanism Syndrome" in the medical community. Mulibrey Nanism Syndrome
A condition marked by slow or halted growth that includes abnormalities of the muscles, brain, eyes and liver. It also includes restrictive pericarditis (inflammation of the membrane around the heart), heart failure and other heart-related problems. More Information on Mulibrey Nanism Syndrome: Heart Injuries & Infections
"Gruber Syndrome" is more commonly referred to as "Meckel Gruber Syndrome" in the medical community. Meckel Gruber Syndrome
Also Known As: "Dysencephalia Splanchnocytica"
A genetic disorder present from birth that is fatal due to kidney failure. Along with the primary birth defects associated with this condition, patients may have one or more heart defects (e.g., septal defects, patent ductus arteriosus). More Information on Meckel Gruber Syndrome: Pediatric Heart
"GSS" is more commonly referred to as "Gerstmann Straussler Scheinker Disease" in the medical community. Gerstmann Straussler Scheinker Disease
An extremely rare form of transmissible spongiform encephalopathy (TSE) that is almost always inherited. It involves brain deterioration, causing severe disability and, eventually, death. More Information on Gerstmann Straussler Scheinker Disease: Encephalopathy
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