Browse our Health Library to learn about treatments, conditions, and how Cedars-Sinai can support your healthcare needs.
Haemophilus influenzae (H. influenzae) is a group of bacteria that can cause different types of infections in babies and children. H. influenzae most often cause ear, eye, or sinus infections. They also cause pneumonia.
Hand-foot-and-mouth disease is an illness caused by a virus. It causes a rash that appears on the palms of the hands and soles of the feet.
Thyroiditis is when your thyroid gland becomes irritated. Hashimoto’s thyroiditis is the most common type of this health problem. It is an autoimmune disease. It occurs when your body makes antibodies that attack the cells in your ...
A head injury is a broad term that describes a vast array of injuries that occur to the scalp, skull, brain, and underlying tissue and blood vessels in the head. Head injuries are also commonly referred to as brain injury, or traumatic ...
A head injury can be as mild as a bump, bruise (contusion), or cut on the head. Or it can be a concussion, a deep cut or open wound, broken skull bones, internal bleeding, or damage to the brain. Head injuries are one of the most common ...
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.
Nearly everyone has suffered from a headache. This article discusses several types of headache, how they are diagnosed and treated.
A headache is pain or discomfort in one or more areas of the head or face. Headaches can happen once in a while. Or they may happen often.
When you have heart block, there is interference with the electrical signals that usually move from the top chambers of your heart to the bottom chambers, telling your heart when to beat.
Heart failure is when the heart can't pump enough blood to the body. In children, it is often caused by a congenital heart defect.
Heart murmurs are extra or unusual sounds made by blood moving through the heart. Many children have heart murmurs. Some cause no problems or go away over time. Others require treatment.
Your immune system’s job is to seek out destroy foreign substances in the body. It destroys bacteria and viruses to help keep you healthy. Normally, this is a good thing, but sometimes the immune system’s response can lead to problems.
H. pylori (Helicobacter pylori) is a type of bacteria that infects your stomach. It can damage the tissue in your stomach and the first part of your small intestine (the duodenum). In some cases it can also cause painful sores called ...
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 ...
HELLP syndrome is a rare but life-threatening condition in pregnancy. It causes red cells in the blood to break down. It also causes problems with the liver, bleeding, and blood pressure. It is often linked with preeclampsia and ...
Hemifacial microsomia (HFM) is a congenital disorder. This means that your child is born with it. In this condition, 1 side of your baby’s face is underdeveloped (hemi means half). HFM usually only affects 1 side of the face. Sometimes ...
Hemoglobin is the part of red blood cells that carries oxygen to cells, tissues, and organs. Hemoglobin C disease is caused by abnormal hemoglobin.
Hemoglobin E trait is an inherited blood disorder. That means it is passed down through your parent’s genes. It occurs most often in people of Southeast Asian descent. Many people with hemoglobin E trait have no symptoms.
Hemolytic anemia is a disorder in which red blood cells are destroyed faster than they are made.
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.
Hemolytic disease of the newborn (HDN) is a blood problem in newborns. It occurs when your baby's red blood cells break down at a fast rate. It’s also called erythroblastosis fetalis.
Hemolytic uremic syndrome (HUS) is a rare condition that can lead to kidney failure. The syndrome harms the small structures and vessels inside the kidneys. HUS causes red blood cells to clog the tiny blood vessels in the kidneys. It may...
Hemophilia is an inherited bleeding disorder. Children with hemophilia can’t stop bleeding because they don’t have enough clotting factor in their blood. Clotting factors are needed for blood to clot. Blood clots to prevent excessive ...
Hemorrhoids are when the veins or blood vessels in and around your anus and lower rectum become swollen and irritated. This happens when there is extra pressure on these veins.
Hemorrhoids and varicose veins might seem to be two different, unrelated problems, but they are actually quite similar. And, many women, especially those in the third trimester of pregnancy, have them.
Henoch-Schönlein purpura (HSP) is a condition that involves swelling (inflammation) of small blood vessels. The swollen blood vessels leak into the skin, joints, intestines, and kidneys.
Hepatitis A is a liver disease that is easily spread from person to person (highly contagious). Hepatitis is a redness or swelling (inflammation) of the liver that sometimes causes lasting damage. Hepatitis A is one type of hepatitis.
Hepatitis is a redness and swelling (inflammation) of the liver. It sometimes causes permanent liver damage.
Hepatitis C is a liver disease that is caused by the hepatitis C virus. It is a redness and swelling (inflammation) of the liver that sometimes causes lasting damage. The liver isn’t able to work the way it should.
Hepatitis is an inflammation of the liver. It can damage and destroy liver cells.