Anthropogenic impacts have been a large input on the affects towards marine mammals, and cetaceans in particular. These impacts come from transportation, recreational and industrial needs that can lead to entanglements, toxins, and boat injuries. One of the most rising concerns is sound pollution. Many mass stranding events have occurred around the world that may be linked to sonar use by the U.S. Navy. This study examines literature on the impacts of low frequency active sonar (LFAS) on various cetacean species. Stranding events have occurred in places including the Bahamas, the Canary Islands and the Greek Ionian Sea. Some of the strandings have not been linked to sonar use, and could have been caused by disease, injuries, or confusion with echolocation. The stranding events that have been associated with sonar use have shown that stranded cetaceans developed many physiological problems. The main concern is gas cavity formation within blood vessels and tissues in the liver and kidneys. Gas cavities can lead to lesions in tissues and could grow large enough to block blood vessels. Studies have shown that high sound pressure levels are needed to cause gas cavities to grow at increased rates that are potentially dangerous. It is not conclusive that sonar leads to immediate strandings; more research is necessary to show this. However, evidence has shown physiological damage due to gas cavity formation, which could lead to diseases that may eventually cause the cetaceans to strand.