Jump to:  A   |   B   |   C   |   D   |   E   |   F   |   G   |   H   |   I   |   J   |   K   |   L   |   M   |   N   |   O   |   P   |   Q   |   R   |   S   |   T   |   U   |   V   |   W   |   X   |   Y

Health Library A to Z

H

  • About the Heart and Blood Vessels
  • Detailed anatomical description of the heart's blood vessels, including simple definitions and a labeled, full-color illustration

  • Blood in the Eye (Hyphema)
  • Symptoms of hyphema include blood visible in the eye, usually following some type of trauma. Immediate medical care is necessary.

  • Clubfoot
  • Detailed information on clubfoot, including causes, risk factors, diagnosis, treatment, and cast care

  • Dialysis
  • Detailed information on dialysis, including peritoneal dialysis and hemodialysis

  • Haemophilus Influenzae Type b (Hib)
  • Haemophilus influenzae type b is a serious bacterial disease that usually strikes children younger than 5. It is spread from person-to-person by coughing and sneezing.

  • Have a Hazard-Free Halloween
  • Halloween safety begins at home, with the child's costume. Every part of the costume -- masks, beards, wigs and clothing -- should be made of flame-resistant material.

  • Head Injury in Children
  • The more common causes of head injury in children are falls, motor vehicle accidents—in which the child is either a passenger or a pedestrian—or a result of child abuse.

  • Head Lice
  • Head lice are tiny parasitic bugs that can infest the skin. They live on people’s heads and feed on their blood. Head lice can cause intense itching.

  • Headaches in Children
  • Many headaches in children may be caused by tight muscles and dilated blood vessels in the head. Other headaches may be caused by an actual problem, such as a tumor or malformation of the brain, although this is much less common.

  • Healthy Diets Overview
  • Eating healthy is an important part of a healthy lifestyle and is something that should be taught to children at a young age.

  • Healthy Sleep Habits
  • The normal amount of sleep varies depending on the age of your child. A 2-year-old needs 10 to 12 hours a night, plus naps during the day. By age 6, a child usually has dropped naps, but still needs 10 hours at night.

  • Hearing Aids for Children
  • Hearing aids can help improve hearing and speech, especially in children with hearing loss in the inner ear caused by damaged hair cells or a damaged hearing nerve.

  • Hearing Loss in Babies
  • Hearing loss in babies is rare in this country, but when it does occur, it's important to diagnose it early. Undetected hearing loss can delay speech and language development.

  • Hearing Loss in Children
  • Sensorineural hearing loss involves the inner ear or its connection with the brain. Conductive hearing loss involves the middle or outer ear.

  • Heart Disorders
  • Detailed information on heart disorders in high-risk newborns

  • Heart Failure in Children
  • Heart failure is when the heart can't pump enough blood to the body. Heart failure can affect the right side of the heart, the left side of the heart, or both sides.

  • Heart Murmurs in Children
  • Heart murmurs are extra or unusual sounds made by blood moving through the heart. Murmurs are graded on a scale of 1 to 6, with 1 being very faint and 6 being very loud.

  • Heart Transplant in Children
  • A heart transplant is a surgery to replace a diseased heart with a healthy one from an organ donor. Organ donors are adults or children who have become critically ill, often because because of injury. They will not live because of their illness or injury.

  • Helicobacter Pylori in Children
  • H. pylori (Helicobacter pylori) is a spiral-shaped germ (bacteria) that infects the stomach. It can damage the tissue in your child’s stomach and the first part of the small intestine (duodenum). This can cause redness and swelling (inflammation). It may also cause painful sores called peptic ulcers in the upper digestive tract.

  • Helping Kids Cope with a Divorce
  • Anger, fear, separation anxiety, a sense of abandonment, self-blame, sadness and embarrassment are common reactions to divorce for most children.

  • Helping Kids Get Over their Fears
  • Studies indicate that almost all children report having fears. Some of the most common fears are of bugs or ghosts, and studies have shown that kids are afraid of pretty much the same things no matter where they live in the world.

  • Helping Teens Embrace Self-Care
  • By involving teens as full participants in their self-care, they're more likely to choose healthy behaviors throughout their lives.

  • Hemifacial Microsomia
  • Detailed information on hemifacial microsomia, including types, causes, diagnosis, and treatment

  • Hemolytic Anemia in Children
  • The hemolytic anemias are a group of disorders in which the red blood cells are destroyed faster than the bone marrow can make them. The term for destruction of red blood cells is hemolysis.

  • Hepatitis B (HBV) in Children
  • An infant or young child who contracts hepatitis B is at greater risk of staying infected with the virus and of having life-long liver problems, such as scarring of the liver and liver cancer.

  • Hepatitis in Children
  • Six main types of the hepatitis virus that have been identified: A, B, C, D, E, and G. Vaccination can protect children from several forms of hepatitis.

  • Hepatoblastoma in Children
  • Hepatoblastoma is a very rare cancer. It’s a tumor that starts in the liver. The cancer cells are similar to fetal liver cells. It usually affects children less than 3 to 4 years of age.

  • Herpangina
  • Herpangina is an illness caused by a virus. Your child may have small bumps at the back of the throat or on the roof of the mouth. Your child may also have a high fever.

  • Herpes Zoster (Shingles)
  • Detailed information on shingles, including symptoms, diagnosis, complications, and treatment

  • High-Risk Newborn Blood Disorders
  • Detailed information on blood disorders that place a newborn at higher risk and require clinical care by a physician or other healthcare professional

  • Hirschsprung Disease
  • Hirschsprung disease is a rare birth defect. It affects the nerve cells in the large intestine. These nerve cells control the muscles that move food and waste, or stool, through the large intestine. The large intestine is the last part of the digestive tract.

  • HIV Home Care
  • Detailed information on HIV home care for your child

  • HIV/AIDS and Pregnancy
  • A mother with HIV can pass the virus to her baby during pregnancy, labor and delivery, and breastfeeding.

  • Hodgkin Lymphoma in Children
  • Hodgkin lymphoma is a type of cancer in the lymphatic system. The lymphatic system is part of the immune system. It helps to fight diseases and infections. The lymphatic system also helps with balancing fluids in different parts of the body.

  • Holter Monitoring in Children
  • Holter monitoring is a way to continuously check the electrical activity of the heart. Your child will wear a small device called a Holter monitor for at least 24 to 48 hours. The device constantly checks your child's heart during this time. This is different from electrocardiography (ECG). ECG checks the heart for only a few minutes.

  • Home Page - Adolescent Medicine
  • Detailed information on adolescent medicine, including growth and development, cognitive development, relationship development, health and injury problems, and safety

  • Home Page - Burns
  • Detailed information on burns, including anatomy, classification, treatment, and prevention

  • Home Page - Craniofacial Anomalies
  • Detailed information on craniofacial anomalies, including Cleft Lip, Cleft Palate, Craniosynostosis, Deformational Plagiocephaly, Hemifacial Microsomia, Vascular Malformations, and Hemangiomas

  • Home Page - Hematology and Blood Disorders in Children
  • Detailed information on blood disorders, including Anemia, Aplastic Anemia, Hemolytic Anemia, Iron Deficiency Anemia, Megaloblastic Anemia, Sickle Cell Anemia, Thalassemia, Alpha Thalassemia, Beta Thalassemia (Cooley's Anemia)

  • Home Page - Medical Genetics
  • Detailed information on medical genetics, including chromosome abnormalities, single gene defects, multifactorial inheritance, teratogens, and non-traditional inheritance

  • Hospice
  • The goal of hospice care is to provide the terminally ill child peace, comfort, and dignity.

  • How Old Is "Old Enough" for Contacts?
  • There are no set rules with children and lenses. Much depends on the responsibility level of the child. Children as young as 8 may do well with contact lenses, but there are some older teens who may be too immature to handle the responsibility.

  • How the Liver Works
  • Detailed information on how the liver works, including a full-color, labeled illustration of the digestive system

  • How to Bathe Your Baby
  • As a new parent, you may find "tub time" a bit scary. Here are some suggestions on how to make it less stressful.

  • How to Comfort a Crying Baby
  • Some babies cry for long stretches at 3 and 12 weeks of age during steps in development when their sleep is less settled.

  • How to Quit Smoking, Again
  • Fewer than a quarter of those who attempt to quit are able to make it beyond three months before resuming smoking. Here are suggestions to help you kick the habit, again, for good.

  • How to Use a Pacifier
  • It seems everyone has an opinion about pacifiers. That’s because there are both advantages and disadvantages to using them. Get the full facts so you can make the right choice for your baby.

  • Hydrocele
  • Detailed information on hydrocele, including symptoms, diagnosis, and treatment

  • Hydrocephalus
  • Hydrocephalus is a condition in which a buildup of fluid in the brain causes the pressure inside of the head to increase and the skull bones to expand to a larger-than-normal appearance.

  • Hydrops Fetalis
  • This is a life-threatening problem of severe swelling in the fetus and newborn. It develops when too much fluid leaves the bloodstream and goes into the tissues.

  • Hyperthyroidism in Pregnancy
  • Uncontrolled hyperthyroidism has many effects. It may lead to preterm birth and low birthweight. It may also bring on pregnancy-induced high bloo pressure.

  • Hypocalcemia
  • A baby with this condition has too little calcium in the blood. Hypocalcemia is more common in premature and low birthweight babies.

  • Hypoglycemia in a Newborn Baby
  • Hypoglycemia is when the level of sugar (glucose) in the blood is too low. Glucose is the main source of fuel for the brain and the body. In a newborn baby, low blood sugar can happen for many reasons. It can cause problems such as shakiness, blue tint to the skin, and breathing and feeding problems.

  • Hypoglycemia in Children
  • Hypoglycemia is when the level of sugar (glucose) in the blood is too low. Glucose is the main source of fuel for the brain and the body. The normal range of blood glucose is about 70 to 140 milligrams per deciliter (mg/dL). The amount blood differs based on the most recent meal. Babies and small children with type 1 diabetes will have different goal ranges of blood glucose levels. 

  • Hypoparathyroidism in Children
  • Hypoparathyroidism is when the parathyroid glands don’t make enough parathyroid hormone. The parathyroid glands are 4 tiny glands on the thyroid. The hormone they make helps manage levels of calcium in the bloodstream. Low levels of the hormone leads to low levels of calcium. This can lead to muscle spasms and cramping, called tetany.

  • Hypopituitarism in Children
  • Hypopituitarism means that the pituitary gland is not working normally. The pituitary gland is a pea-sized gland located at the base of the brain. It’s the master endocrine gland in the body. The pituitary gland normally releases as many as 8 different hormones. These hormones control growth, metabolism, blood pressure, and other body processes. The effects of hypopituitarism may be slow over time. Or they may be sudden.

  • Hypoplastic Left Heart Syndrome
  • Hypoplastic left heart syndrome (HLHS) is a group of defects of the heart and large blood vessels. A child is born with this condition (congenital heart defect). It occurs when part of the heart doesn't develop as it should during the first 8 weeks of pregnancy.

  • Hypospadias
  • Hypospadias is a disorder in newborn boys in which the opening of the urethra is not located at the tip of the penis.

  • Hypothyroidism in Children
  • Hypothyroidism is the condition in which the thyroid is underactive—producing too little thyroid hormone.

  • Management of Hearing Loss
  • A child's hearing loss may be helped with hearing aids or cochlear implants. Training in sign language and lip reading is another option.

  • Treatment for Human Bites
  • Human bite wounds are more likely to become infected than dog or cat bites. A doctor should check any human bite that breaks the skin.

  • Types of Hearing Tests for Infants and Children
  • One type of hearing screening test for newborns uses a tiny, flexible plug that is inserted into the baby's ear. The other type of test uses electrodes attached with adhesive to the baby's scalp.

  • Vascular Malformations and Hemangiomas
  • The term “birthmark” may be a misnomer. These usually harmless skin discolorations can appear any time in the first few months after birth. They’re generally nothing to worry about. But, in some cases, they may need treatment. Here are the most common birthmarks and what to do if they show up on your child.