Whether an essential oil provides immediate relief depends on the type of oil you are using and the symptom and/or condition you are trying to treat. Lavender, for example, may help soothe anxiety and help you fall asleep quickly. Whereas peppermint essential oil may require repeated use in order to soothe the digestive tract and reduce painful UC symptoms. In many cases, you may notice improved symptoms after using the essential oil over a period of time.