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Hypodontia
Hypodontia is a developmental condition in which one or more permanent teeth do not form. The missing teeth are present from birth…
Hypokalemia
Hypokalemia is the medical term for a potassium level in the blood that is lower than the body needs. Potassium helps muscle…
Hyponatremia
Hyponatremia is a lower-than-normal concentration of sodium in the blood. Sodium helps control the balance of water in and around cells and…
Hypopituitarism
Hypopituitarism occurs when the pituitary gland produces too little of one or more important hormones. The pituitary is a small gland at…
Hypospadias
Hypospadias is a congenital difference in which the opening of the urethra is not at the usual tip of the penis. It…
Hypothyroidism
Hypothyroidism is an underactive thyroid that does not produce enough thyroid hormone. This hormone helps regulate metabolism, which affects how the body…
Ichthyosis Vulgaris
Ichthyosis vulgaris is a common inherited tendency toward dry, thickened, scaly skin. It often affects the shins and lower legs, arms, and…
Icsi
ICSI, or intracytoplasmic sperm injection, is an assisted reproduction procedure usually performed as part of an IVF cycle. In a laboratory, an…
Idiopathic Pulmonary Fibrosis
Idiopathic pulmonary fibrosis (IPF) is a long-term lung disease in which scar tissue gradually builds up in the lungs. “Idiopathic” means the…
Immunology and Allergy
Diagnosis and treatment for allergic reactions, immune deficiencies, and autoimmune conditions affecting the body's defenses.
Immunotherapy
Immunotherapy is a type of cancer treatment that helps the immune system recognize, attack, or control cancer cells. Unlike chemotherapy and some…
Inborn Errors Of Metabolism
Inborn errors of metabolism are a broad group of inherited conditions that affect how the body breaks down, transports, stores, or uses…
Incisional Hernia
An incisional hernia is a bulge that develops at or near a weakened area of the abdominal wall where an earlier surgery…
Indigestion
Indigestion, also called dyspepsia, is discomfort or an unpleasant feeling in the upper abdomen after or around eating. It is a pattern…
Infectious Colitis
Infectious colitis is inflammation of the colon caused by an infection. Bacteria, viruses or parasites can irritate the colon and lead to…
Infectious Diseases
Diagnosis and treatment for infections caused by bacteria, viruses, fungi, and parasites, including prevention and control.
Infectious Gastroenteritis
Infectious gastroenteritis is an infection that causes inflammation in the stomach or intestines. It often leads to sudden digestive symptoms such as…
Infiltrative Cardiomyopathy
Infiltrative cardiomyopathy is a group of heart-muscle conditions in which abnormal material builds up in or between heart cells. The material may…
Inguinal Hernia
An inguinal hernia occurs when tissue, such as fat or part of the intestine, pushes through a weak area in the lower…
Innate Immunity Disorders
Innate immunity disorders are a group of conditions that affect the body's early defenses against infection and injury. These defenses include phagocytes,…
Insemination
Insemination is a fertility treatment that places sperm into the female reproductive tract to improve the chance of fertilization. In clinical care,…
Insomnia
Insomnia is persistent difficulty falling asleep, staying asleep, or waking too early despite having enough opportunity to sleep. It can leave you…
Insufficient Sleep Syndrome
Insufficient sleep syndrome means regularly getting less sleep than your body needs, often because of personal choices, work, school, or other schedule…
Insulin Resistance
Insulin resistance means the body's cells do not respond as effectively as they should to insulin. Insulin is a hormone that helps…
