A trigger (from the Dutch trekken, meaning to pull) is a lever which, when pulled by the finger, releases the hammer on a firearm. In a database, a trigger is a set of Structured Query Language (SQL) statements that automatically fires off an action when a specific operation, such as changing data in a table, occurs. A trigger consists of an event (an INSERT, DELETE, or UPDATE statement issued against an associated table) and an action (the related procedure).
There are a wide variety of conditions that can be considered in the differential diagnosis of a Chiari malformation. The symptoms commonly associated with a Chiari malformation are vague and common to numerous other conditions. Some disorders are common misdiagnoses for individuals with a Chiari malformation. Such conditions include multiple sclerosis, chronic fatigue syndrome, fibromyalgia and spinal cord tumors.
Someone may have a Type I Chiari malformation for years without knowing it â Chiari often produces no symptoms until adolescence or early adulthood. The malformation is sometimes identified when a patient has an MRI scan for another reason, but it's more typically identified after symptoms begin to appear. Those symptoms may include: 1  Headache that gets worse with exertion, including exercise, coughing, sneezing, or laughing. 2  Neck pain, specifically at the base of the neck or between the shoulder blades. 3  Dizziness. 4  Tingling or numbness, usually in the hands (and rarely in the legs) 5  Unsteady gait. 6  Loss of fine motor skills.