Asthma is a chronic, inflammatory lung disease with recurrent breathing problems.

The most effective ways to treat allergies are avoidance, allergy immunotherapy, and medicine.

Detailed information on allergy, including symptoms, diagnosis, and treatment

Avascular necrosis develops when blood supply to a bone is cut off. This causes the bone to die and can cause pain and joint problems.

A blood transfusion is a procedure in which you receive blood or parts of blood through an IV (intravenous) line.

Thrombocythemia is a disease in which your bone marrow makes too many platelets. Platelets are blood cell fragments that help with blood clotting. Having too many platelets makes it hard for your blood to clot normally. This can cause too much clotting or not enough clotting.

Detailed information on thalassemias, including alpha thalassemia, beta thalassemia (Cooley's anemia)

Detailed information about hematology and blood disorders, including blood donations, blood banking, blood transfusion, bone marrow transplantation, aplastic anemia, anemia of folate deficiency, glucose-6-phosphate dehydrogenase deficiency, hemolytic anem

Sickle cell disease (SCD) is an inherited blood disorder that causes the body to make abnormal hemoglobin. This is the protein in red blood cells that carries oxygen to all parts of your body. The damaged red blood cells block blood flow in small blood vessels. This causes pain and can damage major organs.

Detailed information on lymphomas, including Hodgkin's lymphoma and non-Hodgkin's lymphoma