High-output heart failure: What It Is, Why It Happens, and How It’s Managed
High-output heart failure can feel confusing: the heart may be pumping more blood than usual, yet the body still behaves as if it isn’t...
Holt-Oram syndrome: Symptoms, Diagnosis, and Cardiac Monitoring Plan
Holt-Oram syndrome is a rare condition that links two parts of the body that develop early in pregnancy: the hands/arms and the heart. Some...
Hughes-Stovin syndrome: Causes, Hemoptysis Warning Signs, and Treatment Options
Hughes-Stovin syndrome is a very rare condition in which inflammation in blood vessels can lead to two dangerous problems at the same time: blood...
Hydropericardium: Causes, Symptoms, Diagnosis, and Treatment Options
Hydropericardium means an abnormal buildup of clear fluid around the heart. That fluid collects inside the pericardial sac, a thin “sleeve” that normally holds...
Hypercholesterolemia: Causes, LDL Goals, and Evidence-Based Treatment
Hypercholesterolemia means your blood cholesterol is higher than is healthy for your arteries over time. The concern is not the number alone, but what...
Hyperchylomicronemia: Causes, Pancreatitis Risk, and Treatment Strategies
Hyperchylomicronemia is a condition where fat-rich particles called chylomicrons build up in the bloodstream, often driving triglycerides to extremely high levels. Chylomicrons normally appear...
Hypercoagulability: Blood Clot Risk, Key Triggers, Testing, and Prevention
Hypercoagulability means the body is more likely than usual to form blood clots. Sometimes this tendency is mild and never causes problems. Other times,...
Hyperhomocysteinemia: Causes, Risk Factors, Complications, and How to Manage It
Hyperhomocysteinemia means you have a higher-than-expected level of homocysteine—a natural substance your body makes when it uses protein—in your blood. For many people, this...
Hyperlipidemia: Causes, Risk Factors, Symptoms, Tests, and Treatment Options
Hyperlipidemia means you have too much fat-like material in your blood, most often cholesterol and triglycerides. It usually causes no symptoms, so many people...
Hyperlipoproteinemia: Risk Factors, Lab Tests, and What Results Mean
Hyperlipoproteinemia is a condition where the blood contains too many lipoproteins—particles that carry fats in blood. Because lipoproteins transport cholesterol and triglycerides, the condition...
Hyperparathyroid hypertension: Causes, Symptoms, Diagnosis, and Treatment Pathways
“Hyperparathyroid hypertension” describes high blood pressure that occurs alongside an overactive parathyroid system—most often in primary hyperparathyroidism. In this condition, the body makes too...
Hypertensive crisis: Emergency Symptoms, Diagnosis, and Immediate Treatment
A hypertensive crisis is a sudden, dangerous rise in blood pressure that can threaten the brain, heart, kidneys, or major blood vessels. It often...
Hypertensive pulmonary edema: Causes, Risk Factors, and Prevention After an Episode
Hypertensive pulmonary edema is a medical emergency where fluid rapidly fills the air spaces of the lungs during a sharp rise in blood pressure....
Hypertriglyceridemia: Causes, Symptoms, Diagnosis, and Treatment That Works
Hypertriglyceridemia means you have too many triglycerides (a common blood fat) circulating in your bloodstream. For many people it shows up quietly on a...
Hypertrophic cardiomyopathy: Symptoms, Causes, Diagnosis, and Modern Treatment Options
Hypertrophic cardiomyopathy is a condition where the heart muscle becomes abnormally thick. That thickness can make the heart stiff, reduce how well it fills,...
Hypertrophic obstructive cardiomyopathy: Symptoms, Diagnosis, Treatment Options, and Daily Management
Hypertrophic obstructive cardiomyopathy (HOCM) is a condition where the heart muscle—most often the wall between the two pumping chambers—becomes thick and stiff. In many...
Hypertrophic subaortic stenosis: Symptoms, Diagnosis, Treatment Options, and Daily Management
Hypertrophic subaortic stenosis is an older name for a condition now most often called obstructive hypertrophic cardiomyopathy (HCM)—a disease where the heart muscle becomes...
Hyperviscosity syndrome: Management After an Episode, Monitoring, and Recurrence Prevention
Hyperviscosity syndrome happens when blood becomes too “thick” to flow easily through small vessels. That thickness can rise quickly—often because of very high blood...
Hypocalcemic cardiomyopathy: Symptoms, Causes, Diagnosis, and Reversible Treatment Options
Hypocalcemic cardiomyopathy is a form of heart muscle weakness caused by low calcium in the blood for long enough that the heart cannot contract...
Hypokinesia of the heart: Symptoms, Coronary Causes, and When It’s Urgent
“Hypokinesia of the heart” is not a stand-alone disease. It is a finding that means part of the heart muscle moves less than expected...
Hypomagnesemia-induced arrhythmia: Why Low Magnesium Triggers Dangerous Heart Rhythms
Magnesium is a quiet workhorse in the body: it helps nerves fire, muscles relax, and the heart keep a steady rhythm. When magnesium drops...
Hypoplastic aortic arch: Prenatal Detection, Delivery Planning, and Early Care
A hypoplastic aortic arch is a condition present at birth (congenital—“there from birth”) where the curved section of the body’s main artery is smaller...
Hypoplastic coronary artery disease: Overview, Causes, Symptoms, Diagnosis, and Care
Hypoplastic coronary artery disease is a rare condition present from birth in which one or more of the heart’s main blood vessels are unusually...
Hypoplastic left heart syndrome: Overview, Early Signs, Diagnosis, and Treatment Pathways
Hypoplastic left heart syndrome (HLHS) is a serious heart condition that starts before birth, when the left side of the heart does not form...