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A to Z

  • A to Z Symptom: Diarrhea A to Z Symptom: Diarrhea

    Diarrhea (loose, watery, or more frequent stools) can be a symptom of many conditions, including common infections. Most cases go away in a few days with proper home care.

  • A to Z Symptom: Dizziness A to Z Symptom: Dizziness

    Dizziness refers to feelings of lightheadedness, vertigo, or disequilibrium.

  • A to Z: Deformity, Acquired A to Z: Deformity, Acquired

    Learn about complications of injuries and illnesses and conditions that affect the size and shape of body parts.

  • A to Z: Deformity, Congenital A to Z: Deformity, Congenital

    Learn about types of birth defects and conditions that affect the size and shape of body parts.

  • A to Z: Dehydration A to Z: Dehydration

    Learn about dehydration, a condition that occurs when someone loses more fluids than he or she takes in.

  • A to Z: Dental Cavities A to Z: Dental Cavities

    A dental cavity is a hole in the tooth that can grow bigger and deeper over time.

  • A to Z: Depression A to Z: Depression

    Depression is a mood disorder that can affect people of all ages, including kids and teens.

  • A to Z: Dermatitis A to Z: Dermatitis

    Learn about dermatitis, inflammation of the skin that causes itching and discomfort.

  • A to Z: Dermatitis, Atopic A to Z: Dermatitis, Atopic

    Learn about atopic dermatitis, an inflammation of the skin that causes itching and discomfort.

  • A to Z: Dermatitis, Contact A to Z: Dermatitis, Contact

    Learn about contact dermatitis, inflammation of the skin that causes itching and discomfort.

  • A to Z: Dermatitis, Infantile Seborrheic A to Z: Dermatitis, Infantile Seborrheic

    Learn about dermatitis, inflammation of the skin that causes itching and discomfort.

  • A to Z: Dermatitis, Seborrheic A to Z: Dermatitis, Seborrheic

    Learn about seborrheic dermatitis, inflammation of the skin that causes itching and discomfort.

  • A to Z: Dermatomyositis A to Z: Dermatomyositis

    Learn about dermatomyositis, an inflammatory muscle disease that weakens muscles and produces a distinctive skin rash.

  • A to Z: Dermatophytosis (Ringworm) A to Z: Dermatophytosis (Ringworm)

    Dermatophytosis, or ringworm, is a highly contagious infection of the skin, hair, or nails caused by a type of fungus called a dermatophyte.

  • A to Z: Developmental Delay A to Z: Developmental Delay

    As kids grow they develop socially and emotionally, and they learn speech, language, motor skills, and cognitive thinking. But in some kids that development can be delayed. Learn more here.

  • A to Z: Developmental Dysplasia of the Hip (DDH) A to Z: Developmental Dysplasia of the Hip (DDH)

    In this condition, dislocation of the hip joint around the time of birth can affect a child's growth, development, and movement.

  • A to Z: Diabetes A to Z: Diabetes

    Diabetes is a disease that affects the way the body handles glucose, a sugar released by the foods we eat.

  • A to Z: Diabetes Insipidus, Central A to Z: Diabetes Insipidus, Central

    In central diabetes insipidus, the kidneys make large amounts of urine, causing the body to lose too much water.

  • A to Z: Diabetes Insipidus, Nephrogenic A to Z: Diabetes Insipidus, Nephrogenic

    In nephrogenic diabetes insipidus, the body loses too much water because of a problem with the kidneys.

  • A to Z: Diabetes, Type 1 A to Z: Diabetes, Type 1

    Diabetes is a disease that affects how the body uses glucose. In type 1 diabetes, the pancreas doesn't make enough insulin, a chemical in the body that helps glucose enter the cells.

  • A to Z: Diabetes, Type 2 A to Z: Diabetes, Type 2

    Diabetes is a disease that affects how the body uses glucose. In type 2 diabetes, the body can't respond normally to insulin, a hormone that helps glucose enter the cells.

  • A to Z: Diabetic Ketoacidosis A to Z: Diabetic Ketoacidosis

    Diabetic ketoacidosis (DKA) can be a life-threatening complication of uncontrolled diabetes.

  • A to Z: Diastrophic Dysplasia A to Z: Diastrophic Dysplasia

    Diastrophic dysplasia is a rare genetic disorder that interferes with bone development and causes abnormal bone growth and dwarfism (short stature).

  • A to Z: Diplegia A to Z: Diplegia

    Learn about conditions that affect the brain, central nervous system, and muscle coordination.

  • A to Z: Dislocation, Elbow A to Z: Dislocation, Elbow

    A dislocation is when the bones in a joint slip out of their normal position. A dislocated elbow happesn when the upper and lower parts of the arm to slip out of position.

  • A to Z: Dislocation, Finger A to Z: Dislocation, Finger

    A dislocation is when the bones in a joint slip out of their normal position. A finger dislocation may happen from a fall, blow, or sports injury, especially if the finger is bent back or jammed.

  • A to Z: Dislocation, Hip A to Z: Dislocation, Hip

    A dislocation is when the bones in a joint slip out of their normal position. A hip dislocation is an injury that occurs when the ball of the thighbone moves out of the socket of the hipbone.

  • A to Z: Dislocation, Shoulder A to Z: Dislocation, Shoulder

    A shoulder dislocation causes the top of the upper arm bone (humerus) to slip out of its normal position in the shoulder socket.

  • A to Z: Dislocation, Thumb A to Z: Dislocation, Thumb

    A dislocation is when the bones in a joint slip out of their normal position. A dislocated thumb may happen from a fall, blow, or sports injury, especially if the thumb is bent back or jammed.

  • A to Z: Dislocation, Toe A to Z: Dislocation, Toe

    A dislocation is when the bones in a joint slip out of their normal position. A dislocated toe may happen from a blow or jamming the toe, such as bumping the toe into furniture or during sports.

  • A to Z: Disuse Osteoporosis A to Z: Disuse Osteoporosis

    See: Osteoporosis, Disuse.

  • A to Z: Down Syndrome A to Z: Down Syndrome

    Learn about Down syndrome (DS), a condition in which extra genetic material causes delays in the way a child develops, both mentally and physically.

  • A to Z: Drug Withdrawal, Newborn A to Z: Drug Withdrawal, Newborn

    Newborn babies who were exposed to drugs or alcohol while in the womb can develop this syndrome after birth. Learn about it here.

  • A to Z: Duodenitis A to Z: Duodenitis

    Learn more about diseases and conditions of the stomach and digestive system.

  • A to Z: Dysmenorrhea A to Z: Dysmenorrhea

    "Dysmenorrhea" means difficult or painful periods.

  • A to Z: Dysphagia A to Z: Dysphagia

    Swallowing difficulties can affect many aspects of a child's health, including feeding, breathing, and overall growth.

  • A to Z: Dyspnea A to Z: Dyspnea

    Learn more about difficult or labored breathing.

  • A to Z: Dysrhythmia A to Z: Dysrhythmia

    Learn more about dysrhythmia: an abnormality in the heart's beat or rhythm caused by electrical impulses functioning improperly.

  • A to Z: Dysuria A to Z: Dysuria

    Learn more about dysuria (or painful urination) and its treatment.

  • A to Z: Eardrum, Perforated A to Z: Eardrum, Perforated

    A perforated (or ruptured) eardrum is a hole in the eardrum caused by injury or infection.

  • A to Z: Eating Disorder A to Z: Eating Disorder

    Eating disorders involve self-critical, negative thoughts and feelings about body weight and food, and eating habits that disrupt normal body function and daily activities.

  • A to Z: Ebstein's Anomaly A to Z: Ebstein's Anomaly

    Learn about Ebstein's anomaly, a rare defect in the right side of the heart that is present at birth (congenital).

  • A to Z: Ectopic Ureter A to Z: Ectopic Ureter

    The kidneys and urinary tract (which includes the ureters) filter and eliminate wastes from the blood. But sometimes a ureter doesn't connect to the bladder in the usual place, a condition known as an ectopic ureter.

  • A to Z: Eczema A to Z: Eczema

    Learn about genetic conditions, allergic reactions, and conditions that can affect the skin.

  • A to Z: Eczema Herpeticum A to Z: Eczema Herpeticum

    Eczema herpeticum is a skin infection that occurs when the skin becomes infected by herpes simplex (the type of viruses that causes cold sores).

  • A to Z: Edema A to Z: Edema

    Learn about edema, swelling due to the build-up of excess fluid in body tissues.

  • A to Z: Encephalopathy A to Z: Encephalopathy

    Learn about encephalopathy, a broad term used to describe brain dysfunction.

  • A to Z: Enchondromatosis A to Z: Enchondromatosis

    See: Chondrodystrophy.

  • A to Z: Encopresis A to Z: Encopresis

    Encopresis (soiling) is a condition that causes a child beyond the age of toilet training to have bowel movements (poop) in his or her underwear.

  • A to Z: Endocardial Cushion Defect A to Z: Endocardial Cushion Defect

    Learn about congenital heart defects and conditions that affect newborn babies.

  • A to Z: Endometritis A to Z: Endometritis

    Learn about complications of infections and conditions that affect the female reproductive system.

  • A to Z: Enlarged Tonsils A to Z: Enlarged Tonsils

    See: Hypertrophy, Tonsillar.

  • A to Z: Enteritis A to Z: Enteritis

    Learn more about this common complication of infections and conditions that can affect the small intestine and digestive system.

  • A to Z: Enterovirus A to Z: Enterovirus

    Enterovirus infections can affect the digestive tract, skin, and respiratory and central nervous systems.

  • A to Z: Enthesopathy A to Z: Enthesopathy

    Learn about rheumatic disorders and conditions that affect the joints and entheses.

  • A to Z: Enuresis A to Z: Enuresis

    Enuresis (bedwetting) is a condition where a person has trouble controlling his or her urination (pee).

  • A to Z: Eosinophilic Esophagitis A to Z: Eosinophilic Esophagitis

    Learn about allergic reactions and diseases of the esophagus and gastrointestinal tract.

  • A to Z: Ependymoma A to Z: Ependymoma

    This tumor forms from cells in the brain and spinal cord that make cerebrospinal fluid. Learn more about this cancer here.

  • A to Z: Epididymitis A to Z: Epididymitis

    Epididymitis refers to swelling and inflammation of the epididymis, the coiled tube at the back of the testicle that holds and carries sperm.

  • A to Z: Epilepsy A to Z: Epilepsy

    Epilepsy is a seizure disorder in which electrical signals in the brain misfire, causing temporary communication problems between nerve cells. Someone who gets recurrent seizures is thought to have epilepsy.

  • A to Z: Epistaxis (Nosebleed) A to Z: Epistaxis (Nosebleed)

    Epistaxis is another word for nosebleed, when small blood vessels break in the tissue lining of the nose.

  • A to Z: Erythema Multiforme A to Z: Erythema Multiforme

    Erythema multiforme is a skin condition caused by a hypersensitive reaction to an infection or, in some cases, medication.

  • A to Z: Esophagitis A to Z: Esophagitis

    Learn about conditions that affect the esophagus and upper gastrointestinal tract.

  • A to Z: Expressive Language Disorder A to Z: Expressive Language Disorder

    This type of speech problem can make it hard for kids to put words together and express what they want to say. Learn more here.

  • A to Z: Q Fever A to Z: Q Fever

    Learn more about this bacterial infection that can be transmitted from animals to humans.

  • A to Z: Quadriplegia A to Z: Quadriplegia

    Learn about complications of spinal cord injuries and conditions that affect the central nervous system.

  • A to Z: Warts A to Z: Warts

    Learn about warts, skin growths caused by viruses of the human papillomavirus (HPV) family.

  • A to Z: Wegener's Granulomatosis A to Z: Wegener's Granulomatosis

    Learn about Wegener's granulomatosis, an uncommon autoimmune disorder that causes inflammation of the blood vessels.

  • A to Z: Wheezing A to Z: Wheezing

    A "wheeze" is a high-pitched whistling sound made when air flows through narrowed airways in the lungs.

  • A to Z: Wolff-Parkinson-White (WPW) Syndrome A to Z: Wolff-Parkinson-White (WPW) Syndrome

    Learn about Wolff-Parkinson-White Syndrome, a congenital heart condition that can cause an abnormally fast heart rhythm known as supraventricular tachycardia.

  • A to Z: Wound Dehiscence A to Z: Wound Dehiscence

    Wound dehiscence is a condition where a cut made during a surgical procedure separates or ruptures after it has been stitched back together.

  • A to Z: Zika Virus A to Z: Zika Virus

    Zika is a virus that a person can get from being bitten by an infected mosquito. The virus is of particular concern for pregnant women and women who may become pregnant.

  • A to Z: Zona A to Z: Zona

    Learn about viral infections and causes of skin conditions.

  • A to Z: Zoonosis A to Z: Zoonosis

    Learn more about diseases, infections, and conditions transmitted to humans from animals.

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