Apr 25, 2022 · A high red blood cell count may be a symptom of many health conditions, including dehydration, heart disease, lung disease and kidney cancer.

Jan 21, 2025 · Heart failure — a condition in which the heart doesn't pump blood as well as it should. Hemoglobinopathy — a condition present at birth that makes red blood cells less able to carry oxygen.

Nov 8, 2023 · In infants, a temporary increase in red blood cells is normal. Still, a high red blood cell count in adults can increase the risk of dangerous blood clots.

Oct 31, 2025 · When your red blood cell count is high, your blood becomes thicker and harder for your heart to pump through your body. This condition, called polycythemia or erythrocytosis, can happen …

Polycythemia (high red blood cell count) is a condition in which the body's red blood cells are elevated. Learn the causes, symptoms, diagnosis, and treatment of polycythemia.

5 days ago · A high red blood cell count can stem from dehydration or something more serious. Learn what causes it, what symptoms to watch for, and when to see a doctor.

Dec 14, 2025 · Key Takeaways A red blood cell count measures the number of red blood cells that carry oxygen in your blood. Low red blood cell counts can indicate anemia, which often causes fatigue and …

Aug 16, 2024 · A high RBC count, also termed erythrocytosis or polycythemia, is an elevated number of red blood cells in the bloodstream. Common symptoms include fatigue, dizziness, and headaches.

Polycythemia (high red blood cell count) refers to an elevated number of red blood cells in the blood. Learn about causes, symptoms, treatment, life expectancy, and prevention.

Jul 31, 2025 · Erythrocytosis is when you have more red blood cells than normal. Learn more about what causes it, symptoms of erythrocytosis, and how it's treated.