Diseases and Conditions

Find doctor-approved information about symptoms, causes, diagnosis, treatment and prevention of common diseases and conditions.


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All conditions that start with the letter H
  • Henoch-Schönlein Purpura

    Henoch-Schönlein purpura (HSP) is a rare disease that irritates and inflames the blood vessels in your skin.

  • Hepatitis A

    Hepatitis A (Hep A) is liver inflammation caused by the hepatitis A virus. It isn’t typically as serious as hepatitis…

  • A 3-D illustration of hepatitis B virus in blood vessel with red blood cells

    Hepatitis B

    Hepatitis B is a serious liver infection caused by a virus. It is usually spread from person to person through…

  • A lab technician holding a blood sample

    Hepatitis C

    Hepatitis C is a serious virus that causes inflammation of the liver. It is spread from person to person through…

  • Hereditary Hemochromatosis

    Hereditary hemochromatosis is a disease in which your body has too much iron. This extra iron can damage your tissues…

  • Hernia

    A hernia is a tear in your muscle or tissue that allows part of your insides to bulge out. Sometimes…

  • illustration of a spinal column with a herniated disk

    Herniated Disc

    A herniated disc happens when a disc in your spine weakens or ruptures, putting pressure on a nerve or the…

  • Herpes

    Herpes is a group of viruses that cause painful blisters and sores. There is no cure, but medicines can treat…

  • closeup of a man wearing a blue shirt with an underarm sweat stain

    Hidradenitis Suppurativa

    Hidradenitis suppurativa is a chronic skin disease that causes painful red bumps in places where hair grows, including armpits, groin…

  • close-up of female doctor checking blood pressure of male patient

    High Blood Pressure

    High blood pressure (hypertension) is a medical condition that occurs when your blood moves through your arteries at higher pressure…

  • High Blood Pressure During Pregnancy

    A small percentage of pregnant women in the U.S. have high blood pressure during their pregnancy. Some cases are mild;…

  • family eating dinner and watching their cholesterol

    High Cholesterol

    High cholesterol is a medical condition that can lead to stroke and heart disease.

  • Mountain climber using mini portable oxygen cylinder to avoid and treat high-altitude illness

    High-Altitude Illness

    High-altitude illness can occur when you travel to altitudes higher than 8,000 feet. It happens when your body doesn’t get…

  • Hip Fractures

    Learn about hip fractures, how they’re treated and how they can be prevented.

  • Best and worst positions for your baby to help prevent hip dysplasia

    Hip Problems in Infants

    A hip problem in an infant is known as developmental dysplasia of the hip. It can lead to dislocation of…

  • newborn baby crying in white bed

    Hirschsprung’s Disease

    Hirschsprung disease is a rare birth defect that is caused by missing nerve cells in the intestine. It is treated…

  • female with hairy arm


    Hirsutism causes women to have excess hair on their face or body. It can have different causes, including genetics and…

  • HIV

    The human immunodeficiency virus (HIV) attacks the body’s immune system. A healthy immune system is what keeps you from getting…

  • Little boy sleeping in his bed suffering from hives

    Hives (Urticaria)

    Hives (urticaria) are bumps or patches on the surface of your skin. They can be red, itchy, and swollen and…

  • Bottle of HPV vaccine sitting next to syringe

    Human Papillomavirus (HPV)

    HPV is a common sexually transmitted virus.