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Hematologists study the blood and blood disorders and diseases. They also usually teach and study the prevention of these diseases.
Pathology is the study of diseases.
Psychopathology is the medical term meaning study of mental diseases.
Dermatology deals with the study of skin and its diseases
The study of the ear is in the field of ear/ nose/ and throat. This field is called otolaryngolgy. The diseases are called otolaryngolic diseases. The doctor in this field is called and ENT doctor.
they study the urinary tract and the diseases you can contract with that specific organ
They study diseases.
phytopathology
IRIDOLOGY
It's a Classification of Diseases
Immunologists study diseases.
Pathology will help you identify and study the microorganisms causing diseases but not necessarily have treatment for them unless you research it.