Which condition results from insufficient levels of hemoglobin?

Anemia is the condition that arises from insufficient levels of hemoglobin in the blood. Hemoglobin is a protein found in red blood cells that is crucial for transporting oxygen from the lungs to the rest of the body. When hemoglobin levels are low, the body does not receive adequate oxygen, leading to various symptoms such as fatigue, weakness, and pallor. There are different types of anemia, which can result from various factors including nutritional deficiencies, chronic diseases, or bone marrow disorders.

In contrast, hypertension relates to high blood pressure and is not directly tied to hemoglobin levels. Leukemia is a cancer of the blood and bone marrow characterized by an overproduction of abnormal white blood cells, whereas thrombosis involves the formation of a blood clot that obstructs blood flow in the vascular system. While these conditions are serious, they do not stem from low hemoglobin levels as anemia does.