This lesson will identify the cause and effects of various blood disorders. [5:21]

Learn what is essential thrombocythemia as well as how to identify its signs and symptoms, diagnose it, and treat it. By Raja Narayan. Visit us (http://www.khanacademy.org/science/healthcare-and-medicine) for health and medicine content...

A video [12:35] that explains iron deficiency anemia as well as some causes and treatments.