Medical diagnosis (often simply termed diagnosis) refers to both the process of attempting to determine or identify a possible disease or disorder (and diagnosis in this sense can also be termed (medical) diagnostic procedure), and to the opinion reached by this process (also being termed (medical) diagnostic opinion). From the point of view of statistics the diagnostic procedure involves classification tests. It is a major component of, for example, the procedure of a doctor's visit.
Essential tremor (ET, also referred to as benign tremor or familiar tremor) is a common neurological disorder typically involving a tremor of the arms, hands or fingers but sometimes involving the head or other body parts during voluntary movements such as eating and writing. It should be distinguished from Parkinson's disease, although some individuals have both conditions. Essential tremor is commonly described as an action tremor (it intensifies when one tries to use the affected muscles) rather than a resting tremor; rigidity, such as is seen in Parkinson’s, is usually not included among its symptoms.
Oral and maxillofacial pathology (also termed oral pathology, stomatognathic disease, or mouth disease) refers to the diseases of the mouth ("stoma") and jaw ("gnath"). It is the term used by MeSH (along with the synonym dental diseases), but other organizations use different terms. The World Health Organization uses the term "Diseases of oral cavity, salivary glands and jaws." The mouth is an important organ with many different functions. It is also prone to a variety of medical and dental disorders.
The specialty oral and maxillofacial pathology is concerned with diagnosis and study of the causes and effects of diseases affecting the oral and maxillofacial regions. It is sometimes considered to be a specialty of dentistry and pathology. Sometimes the term head and neck pathology is used instead, but this might imply that the pathologist deals with otorhinolaryngologic disorders (i.e. ear, nose and throat) in addition to maxillofacial disorders. In this role there is some overlap between the expertise of head and neck pathologists and that of endocrine pathologists.