Haematology, or Hematology, is the branch of biology concerned with the study of blood, blood-forming organs and blood diseases. Haematology includes the study of etiology, diagnosis, treatment, prognosis and prevention of blood diseases. Blood diseases affect the production of blood and its components such as blood cells, hemoglobin, blood proteins, the mechanism of coagulation, etc.

Leukemia, or Leukaemia, is a cancer of the blood or bone marrow. It is characterized by an abnormal proliferation of blood cells, usually white blood cells (leukocytes). Leukemia is a broad term covering a spectrum of diseases.

Thrombocytosis is the presence of high platelet counts in the blood. It can be either reactive or primary.

Thrombotic Thrombocytopenic Purpura (TTP or Moschcowitz disease) is a rare disorder of the blood-coagulation system, causing extensive microscopic blood clots to form in the small blood vessels throughout the body. Most cases of TTP arise from deficiency or inhibition of the enzyme ADAMTS13, which is responsible for cleaving large multimers of von Willebrand factor. Red blood cells passing the microscopic clots are subjected to shear stress which leads to hemolysis. Reduced blood flow and cellular injury results in end organ damage.

Goodpasture’s Syndrome (also known as Goodpasture’s disease or anti-glomerular basement membrane disease) is a rare condition characterized by rapid destruction of the kidneys and hemorrhaging of the lungs. Although many diseases can present with these symptoms, the name Goodpasture’s syndrome is usually reserved for the autoimmune disease produced when the patient’s immune system attacks cells presenting the Goodpasture antigen, which are found in the kidney and lungs, causing damage to these organs.

Multiple Myeloma, also known as MM, myeloma, plasma cell myeloma or as Kahler's disease, is a type of cancer of plasma cells which are immune system cells in bone marrow that produce antibodies. Myeloma is regarded as incurable, but remissions may be induced with steroids, chemotherapy, thalidomide and stem cell transplants. Myeloma is part of the broad group of diseases called hematological malignancies.

Hyperviscosity Syndrome is an increase in the viscosity of the blood. This may be caused by an increase in serum proteins and presents with spontaneous bleeding from mucous membranes, retinopathy and other visual disturbances, and neurologic symptoms ranging from headache and vertigo to seizures and coma.

Hodgkin's Lymphoma, also known as Hodgkin's disease, is a type of lymphoma, characterized clinically by the orderly spread of disease from one lymph node group to another and by the development of systemic symptoms with advanced disease. Pathologically, the disease is characterized by the presence of Reed-Sternberg cells (RS cells).