Diseases and Conditions

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

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  • Doctor listens to young girl’s heartbeat

    Heart Murmurs

    A heart murmur is an abnormal noise between heartbeats. It can be a sign of a heart problem.

  • Photo of an electrocardiogram ecg or ekg printout with stethoscope. Heart palpitations is a condition that feels like your heart is pounding, racing, or skipping beats (fluttering).

    Heart Palpitations

    Heart palpitations is a condition that feels like your heart is pounding, racing, or skipping beats (fluttering).

  • A woman pressing on her chest due to heartburn pain

    Heartburn

    Heartburn is a burning feeling in the lower chest, along with a sour taste in the throat and mouth. It…

  • Senior man with heat exhaustion cools his head with a wet cold cloth

    Heat Exhaustion and Heat Stroke

    Heat exhaustion and heatstroke are serious conditions. Learn the warning signs of these heat-related illnesses, as well as how to…

  • Heat Rash

    Heat rash is a skin irritation that stings and makes your skin red. It is also called miliaria or prickly…

  • A doctor checks the blood pressure of a pregnant woman. HELLP syndrome is a rare but serious pregnancy-related illness, similar to preeclampsia, another pregnancy condition.

    HELLP Syndrome

    HELLP Syndrome is a rare but serious pregnancy-related illness, similar to preeclampsia, another pregnancy condition.

  • illustration of red blood cells in the bloodstream and Hemolytic uremic syndrome (HUS)

    Hemolytic Uremic Syndrome

    Hemolytic Uremic Syndrome is a condition that results from a digestive system infection.

  • A female holds her hands behind her back. Hemorrhoids are swollen or inflamed veins in your rectum or around your anus. They are very common, especially in people who are pregnant.

    Hemorrhoids

    Hemorrhoids are swollen or inflamed veins in your rectum or around your anus. They are very common, especially in people…

  • 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…

  • A picture of lips showing a cold sore caused by herpes

    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 (Hypertension)

    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

    Some women will experience high blood pressure during their pregnancy. Treatment varies depending on the type you have and how…

  • family eating dinner and watching their cholesterol

    High Cholesterol

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