Medicine. A sensation or illusion of movement in which a person senses himself to be revolving in space (subjective vertigo) or having his surrounding environment rotating or spinning (objective vertigo) when he is actually stationary. The term is similar to, but not identical to, dizziness which is a feeling of lightheadedness or being outside one's own body along with a sensation of turning. Additional Info: Vertigo can be a sign of an disorder of the inner ear or head injury. It may be accompanied by dizziness, nausea, imbalance, fuzzy vision or hearing problems. Many specific types of vertigo are known; See: Vertigo-Related Disorders in Merck Source's Resource Library and Further Reading (below) for detailed information. MSDS Relevance: This term usually appears on an MSDS as a symptom of exposure. Vertigo is a symptom of many conditions, including exposure to certain chemicals. If you have been inhaling chemicals and get a feeling of vertigo, remove yourself to fresh air and seek assistance. Check the MSDS sheet to See: If vertigo is a known symptom of exposure; if so, be certain to use personal protective equipment (PPE) and/or a fume hood when dealing with that chemical! See also: Nausea, Prostration