High cholesterol
Overview Cholesterol is a waxy substance found in your blood. Your body needs cholesterol to build healthy cells, but high levels of cholesterol can increase your risk of heart disease.…
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Overview Cholesterol is a waxy substance found in your blood. Your body needs cholesterol to build healthy cells, but high levels of cholesterol can increase your risk of heart disease.…
Overview High blood pressure (hypertension) in children is blood pressure that is at or above the 95th percentile for children who are the same sex, age and height as your…
Overview High blood pressure (hypertension) is a common condition in which the long-term force of the blood against your artery walls is high enough that it may eventually cause health…
Overview Hidradenitis suppurativa Hidradenitis suppurativa (hi-drad-uh-NIE-tis sup-yoo-ruh-TIE-vuh) is a condition that causes small, painful lumps to form under the skin. The lumps usually develop in areas where your skin rubs…
Overview Hiccups: What causes them Hiccups are involuntary contractions of the diaphragm — the muscle that separates your chest from your abdomen and plays an important role in breathing. Each…
Overview Hiatal hernia A hiatal hernia occurs when the upper part of your stomach bulges through the large muscle separating your abdomen and chest (diaphragm). Your diaphragm has a small…
Overview Herniated disk A herniated disk refers to a problem with one of the rubbery cushions (disks) that sit between the individual bones (vertebrae) that stack to make your spine.…
Overview Hereditary hemorrhagic telangiectasia (tuh-lan-jee-uk-TAY-zhuh) is an inherited disorder that causes abnormal connections, called arteriovenous malformations (AVMs), to develop between arteries and veins. The most common locations affected are the…
Overview Hepatopulmonary (hep-uh-toe-POOL-moe-nar-e) syndrome is an uncommon condition that affects the lungs of people with advanced liver disease. Hepatopulmonary syndrome is caused by blood vessels in the lungs expanding (dilating)…
Hepatocellular carcinoma (HCC) is the most common type of primary liver cancer. Hepatocellular carcinoma occurs most often in people with chronic liver diseases, such as cirrhosis caused by hepatitis B…
Overview The liver Hepatitis C is a viral infection that causes liver inflammation, sometimes leading to serious liver damage. The hepatitis C virus (HCV) spreads through contaminated blood. Until recently,…
Overview Hepatitis B is a serious liver infection caused by the hepatitis B virus (HBV). For some people, hepatitis B infection becomes chronic, meaning it lasts more than six months.…
Overview Hepatitis A is a highly contagious liver infection caused by the hepatitis A virus. The virus is one of several types of hepatitis viruses that cause inflammation and affect…
Overview Henoch-Schonlein purpura Henoch-Schonlein purpura (also known as IgA vasculitis) is a disorder that causes the small blood vessels in your skin, joints, intestines and kidneys to become inflamed and…
Overview Hemorrhoids Hemorrhoids (HEM-uh-roids), also called piles, are swollen veins in your anus and lower rectum, similar to varicose veins. Hemorrhoids can develop inside the rectum (internal hemorrhoids) or under…