Hibernating myocardium: What It Means, Viability Testing, and Recovery Potential
Hibernating myocardium is heart muscle that has gone quiet to survive. When a coronary artery delivers too little blood for a long time, the...
High blood pressure: Overview, Causes, Risk Factors, Symptoms, Diagnosis, and Management
High blood pressure is common, often quiet, and highly treatable—but it still drives a large share of heart attacks, strokes, kidney disease, and heart...
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...