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.
Several types of Chiari malformations exist, most of which are due to birth defects. Common symptoms that occur with Chiari malformation include neck pain, dizziness or vertigo, difficulty with vision, coordination problems, and muscle weakness. Symptoms of Chiari malformation may get worse when you cough, sneeze, or stretch your neck. In some cases, Chiari malformation may not ever cause symptoms.