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.
Cluster headache is a medical condition, in which patients typically experience repeated attacks of excruciatingly severe unilateral headache pain. Cluster headache belongs to a group of primary headache disorders, classified as Trigeminal Autonomic Cephalalgias or (TACs). There is currently no known cure for a cluster headache.
Cluster headaches often occur periodically; spontaneous remissions may interrupt active periods of pain, though about 10-15% of chronic cluster headache sufferers never remit. The cause of the condition is not yet known. It affects approximately 0.1% of the population of middle-aged people and men are more commonly affected than women, by a ratio of 2.1:1.
The NIH classification of headaches consists of brief, relatively vague glossary-type definitions of a limited number of headaches.
It outlines five types of headache: vascular, myogenic (muscle tension), cervicogenic, traction, and inflammatory.
Science of drugs including their origin, composition, pharmacokinetics,
pharmacodynamics, therapeutic use, and toxicology.
Pharmacology (from Greek φάρμακον, pharmakon, "poison" in classic Greek; "drug" in modern Greek; and -λογία, -logia "study of", "knowledge of") is the branch of medicine and biology concerned with the study of drug action, where a drug can be broadly defined as any man-made, natural, or endogenous (within the body) molecule which exerts a biochemical and/or physiological effect on the cell, tissue, organ, or organism. More specifically, it is the study of the interactions that occur between a living organism and chemicals that affect normal or abnormal biochemical function. If substances have medicinal properties, they are considered pharmaceuticals.