Symptoms like nausea and vomiting are also commonly present in the early stages of pregnancy. The reviewers found that inhaling peppermint oil had little to no effect on the severity of nausea as a postoperative symptom. Four of the reviewed studies involved peppermint oil compared with a placebo. However, a 2018 review of studies also examined the effects of aromatherapy on postoperative nausea. The researchers found that patients rated their level of nausea as lower after inhaling peppermint oil. One small 2016 study assessed the effect of inhaled peppermint oil on postoperative nausea. Nausea can have many causes, and it often occurs after an operation.
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