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 on the palms of the hands and soles of the feet. It can also occur in the diaper area, and on the legs and arms.
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 ...
Head and neck cancer is the term given to cancers that start in the head and neck region. Learn more about symptoms, diagnosis, and treatments.
A head injury is a broad term that describes many 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 brain injury...
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.
A heart attack happens when the blood supply is cut off from the heart muscle, usually because of a blood clot. Without blood and oxygen, the muscle cells are damaged and die.
Millions of people suffer heart attacks every year. A heart attack can damage the heart’s function, and even lead to death. Learn what happens during a heart attack, and what signs to watch for.
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 a condition in which the heart cannot pump enough blood to meet the body's needs.
Heart failure is when your heart can’t pump enough blood to meet your body’s needs. Learn about the different types of heart failure, and the treatments that can help you manage it.
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 may be caused by a number of factors or diseases, including defective heart valves, fever, and pregnancy.
A heart murmur is blood flow that makes a noise because of a problem in or near the heart. See how a heart murmur occurs, and when it’s a cause for concern.
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.
Heart valves can malfunction on one of two ways: They can fail to close completely, allowing blood to flow backward, or they can become damaged, limiting blood flow.
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 ...
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, one side of your baby’s face is underdeveloped (hemi means half). HFM usually only affects one side of the face. ...
Hemochromatosis is a condition in which a person's body is overloaded with iron. The extra iron builds up in various organs and can cause health problems. This video discusses the possible causes of hemochromatosis, typical symptoms, and...
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. Here's what you need to know.
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.