What Causes High Rbc?

what causes high rbc

High red blood cell (RBC) count, also called erythrocytosis, happens when your body makes too many red blood cells. This can thicken your blood and slow circulation. The most common causes are low oxygen levels in your blood, certain genetic conditions, or lifestyle factors like smoking and dehydration. What Is Considered a High Red Blood … Read more

How Rare Are Black Eyes?

how rare are black eyes

True black eyes, where the iris appears completely black with no visible color, are extremely rare in humans. Unlike common dark brown eyes that can look black in low light, a true black iris is exceptionally uncommon and is almost always linked to a specific genetic condition called aniridia. Most people who describe their eyes … Read more