Inclusion criteria:
Inclusion criteria: age of 18-65 years old;
without history of mental illnesses, headacheas, migraines, asthma, heart disease,respiratory disease and olfactory dysfunction, allergy to the odor of plants specially plants of Citrus aurantium,
the first experience of colonoscopy;
willingness to participant in the study,
ability to speak and comprehend Persian;
being conscious,
Do not take anti-anxiety drugs
Exclusion criteria:
Exclusion criteria: refuse to continue corporation in this study,
cancellation of colonoscopy procedure on the scheduled day,
outbreak of problems such as headaches that cause interruption of the intervention.