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Pathologists provide information that helps physicians care for patients; because of this, the pathologist is sometimes called the "doctor's doctor." When a patient has a tumor, an infection, or symptoms of a disease, a pathologist examines tissues from the patient to determine the nature of the patient's condition. Without this knowledge, a physician would not be able to make an accurate diagnosis and design the appropriate treatment. Because many health conditions first manifest themselves at the cellular level, pathologists are often able to identify conditions before they turn into serious health problems.