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Hairy Leukoplakia
Hairy leukoplakia is a usually painless white, ridged, or hairy-looking patch that develops most often along the side of the tongue. It…
Hallucinations
Hallucinations are sensory experiences that seem real but happen without an external stimulus. A person may hear, see, feel, smell, or taste…
Hand Eczema
Hand eczema is inflammation of the skin on the hands. It may cause dryness, itching, redness, scaling, painful cracks, or small blisters.…
Hand Rejuvenation
Hand rejuvenation is a group of cosmetic treatments designed to refresh hands that look thin, wrinkled, sun-damaged, or unusually veiny. Treatment may…
Hantavirus
Hantavirus is a group of viruses carried mainly by rodents. People may develop a hantavirus infection after breathing in particles contaminated with…
Hashimoto Thyroiditis
Hashimoto thyroiditis is an autoimmune condition in which the immune system mistakenly attacks thyroid tissue. Over time, this inflammation and damage can…
Hba1C Blood Test
An HbA1c blood test measures glycated hemoglobin, also called hemoglobin A1c. Glucose in the blood attaches to hemoglobin inside red blood cells,…
Hct Blood Test
An HCT blood test measures the percentage of your blood volume made up of red blood cells. HCT stands for hematocrit, so…
Hdl Blood Test
An HDL blood test measures the amount of high-density lipoprotein cholesterol in your blood. HDL is often called “good” cholesterol because it…
Head And Neck Cancer
Head and neck cancer is a group of malignant tumors that can develop in the mouth, throat, nose, sinuses, voice box, salivary…
Headache
A headache is pain or discomfort in the head, scalp, face, or upper neck. The location and quality can vary: pain may…
Hearing Loss
Hearing loss means a reduced ability to hear sounds or understand speech. It can range from mild difficulty hearing soft sounds to…
Heart Attack
A heart attack happens when blood flow to part of the heart muscle becomes blocked, usually because of a clot in a…
Heart Failure
Heart failure means the heart cannot pump or fill well enough to meet the body's needs. As a result, the body may…
Heart Valve Disease
Heart Valve Disease is a condition in which one or more of the heart valves do not open or close normally. A…
Heartburn
Heartburn is a burning feeling behind the breastbone or in the upper chest. It can sometimes rise toward the throat and is…
Heat Exhaustion
Heat exhaustion is a heat-related illness that develops when the body cannot cool itself effectively. Excessive heat, sweating, and fluid loss can…
Hematology
Diagnosis and treatment for blood disorders, from anemia and clotting conditions to blood cancers.
Hemochromatosis
Hemochromatosis is a condition in which the body absorbs too much iron from food and stores it in tissues and organs. Inherited…
Hemodialysis
Hemodialysis is a treatment that helps replace some filtering functions of the kidneys when they cannot remove enough waste and extra fluid…
Hemoglobin Blood Test
Hemoglobin is the protein inside red blood cells that carries oxygen from your lungs to the rest of your body. A hemoglobin…
Hemophilia
Hemophilia is an inherited bleeding disorder in which the blood does not clot normally. Hemophilia A involves low or missing clotting factor…
Hepatic Adenoma
A hepatic adenoma, also called a hepatocellular adenoma or liver adenoma, is a usually benign growth made up of liver cells. Many…
Hepatitis B
Hepatitis B is an infection caused by the hepatitis B virus, or HBV, that primarily affects the liver. An acute infection is…
