Anesthesia errors are very closely related to medication errors, which is another medical mistake that falls under the umbrella of medical malpractice. A study of anesthesia-related mortality in the U.S. claims that 2,211 deaths occurred between 1999 and 2005. The specific causes of death include too much anesthesia, adverse effects from anesthesia, and anesthesia complications during pregnancy and childbirth. The study concludes that anesthesia deaths occur at a rate of 1.1 per 1 million people every year.