Olfactory reference syndrome is an intense preoccupation with the belief that a bad or unpleasant odor is emanating from one’s body, breath, sweat, genital area, intestinal gas, or some other source. This belief is often not based on an actual odor detected by others, or if it is, the person perceives it as much more intense and offensive than it actually is. In the DSM-5-TR, this condition is classified under the clinical presentations evaluated within the category of obsessive-compulsive and related disorders.
What Are the Symptoms of Olfactory Reference Syndrome?
The symptoms of olfactory reference syndrome typically revolve around intense and distressing thoughts that the person smells bad. The person may interpret others’ nose-rubbing, opening windows, sitting far away, or whispering as being due to their own odor. These interpretations are often not based on evidence; however, they can feel very real and distressing to the person.
Common symptoms include:
- Constantly thinking they smell bad
- Excessive focus on the smell of breath, sweat, the mouth, the genital area, or the bowels
- Frequently checking one’s own body odor or monitoring others’ reactions
- Excessive showering, changing clothes, brushing teeth, or using deodorant
- Interpreting others’ behavior as “they’re bothered by my odor”
- Avoiding public transportation, work, school, meetings, or close relationships
- Experiencing shame, guilt, worthlessness, and intense anxiety
- Significant difficulty with daily functioning
In Olfactory Reference Syndrome, a person may spend a significant amount of time during the day preoccupied with the thought that they smell bad. This condition is often accompanied by frequent self-checking, attempts to hide the odor, shame, social avoidance, and difficulties in work or school life.
What Causes Olfactory Reference Syndrome?
It is not accurate to point to a single cause for Olfactory Reference Syndrome. It is generally believed that biological, psychological, and social factors play a role together. In some individuals, obsessive thought patterns, excessive focus on bodily sensations, fear of social judgment, or past embarrassing experiences may contribute to the development of symptoms.
Possible factors may include:
- Personality traits prone to anxiety
- A tendency toward obsessive thoughts and compulsive behaviors
- Fear of judgment in social settings
- Sensitivity to body image during adolescence or young adulthood
- A family history of obsessive-compulsive disorder (OCD), anxiety, or depression
- Experiences of being mocked, excluded, or feeling ashamed
- Stressful life events
These factors do not apply to everyone in the same way. While symptoms may develop gradually in some individuals, they may become more pronounced in others following a specific event.
How Does Olfactory Reference Syndrome Manifest in Thoughts and Behaviors?
Olfactory reference syndrome often progresses within a cycle of thoughts, emotions, and behaviors. The person first experiences a distressing thought that they smell bad. Then, to alleviate this thought, they turn to checking or cleaning behaviors. Although there is short-term relief, the cycle starts over when the thought returns.
Common thoughts:
- “People are staying away from me because I smell bad.”
- “Everyone at the meeting noticed my odor.”
- “The person next to me scratched their nose—they must be bothered by me.”
- “No matter how much I clean myself, the smell doesn’t go away.”
- “That’s why no one wants to get close to me.”
Common behaviors:
- Taking multiple showers
- Changing clothes frequently
- Using excessive amounts of perfume, deodorant, or mouth spray
- Constantly brushing teeth or chewing gum
- Asking others for reassurance by asking, “Do I smell?”
- Avoiding close-range conversations with people
- Changing plans to avoid going to crowded places
These behaviors may temporarily reduce a person’s anxiety; however, in the long term, they may contribute to the persistence of olfactory reference syndrome symptoms.
What Is the Relationship Between Olfactory Reference Syndrome and Obsessive-Compulsive Disorder?
Olfactory reference syndrome may share some similarities with obsessive-compulsive disorder. In obsessive-compulsive disorder, a person experiences unwanted, distressing, and repetitive thoughts; they may perform certain behaviors or mental rituals to reduce these thoughts. In olfactory reference syndrome, the belief that one smells bad may be accompanied by behaviors such as frequent checking, cleaning, or seeking reassurance.
However, the two conditions are not the same. In OCD, there can be a wide variety of themes, such as contamination, harm, symmetry, or obsessions with religious or sexual content. Olfactory reference syndrome, on the other hand, centers specifically on the belief that one is “emitting a bad odor.”
Similarities:
- Repetitive and compulsive thoughts
- Behaviors aimed at reducing anxiety
- Checking and seeking reassurance
- Impairment in daily functioning
Differences:
- The central theme in olfactory reference syndrome is the perception of a bad odor.
- Insight—that is, the person’s awareness that their thoughts may not be realistic—can vary.
- Some individuals may believe they are actually perceiving the odor and may therefore delay seeking psychiatric evaluation.
What Is the Difference Between Olfactory Reference Syndrome and Social Anxiety?
In social anxiety disorder, the core issue is the fear of being humiliated, negatively judged, or embarrassed in social settings. The person may worry about making mistakes while speaking, blushing, trembling, or appearing inadequate. In Olfactory Reference Syndrome, however, the core of social anxiety is often the thought, “People are judging me because I smell bad.”
These two conditions can be confused because social avoidance can occur in both. However, the focus is different.
Distinguishing factors:
- In social anxiety, the fear is primarily centered on performance, evaluation, and embarrassment.
- In olfactory reference syndrome, the primary concern is the belief that one is emitting a bad odor.
- In social anxiety, a person may avoid situations out of fear of “saying the wrong thing.”
- In olfactory reference syndrome, the person may avoid situations because they fear others will notice their odor.
Therefore, for an accurate assessment, the timing of symptom onset, the thoughts that sustain them, and the resulting behaviors must be examined in detail.
What Is the Difference Between Olfactory Reference Syndrome and Body Dysmorphic Disorder?
In body dysmorphic disorder, the individual is intensely preoccupied with a feature they perceive as a flaw in their appearance. This flaw may not be noticed by others or may be very minor. For example, there may be intense anxiety regarding the shape of the nose, skin, hair, facial symmetry, or body structure.
Olfactory Reference Syndrome, on the other hand, centers on the perception of smell and the belief that one is emitting a bad odor rather than on appearance. However, there are similarities between the two conditions: In both, excessive preoccupation with the body, as well as behaviors such as checking, hiding/camouflaging, and avoidance, may be observed.
Key differences:
- In body dysmorphic disorder, the focus is primarily on perceived physical flaws.
- In olfactory reference syndrome, the focus is on the belief that one is emitting a bad odor.
- In body dysmorphic disorder, looking in the mirror or hiding one’s appearance may be prominent.
- In Olfactory Reference Syndrome, sniffing, washing, using perfume, and maintaining distance may be more prominent.
Is Olfactory Reference Syndrome the Same as Olfactory Hallucination?
No, they are not the same. Olfactory hallucination is the perception of a smell in the absence of an actual odor source. This condition may be associated with certain neurological diseases, temporal lobe epilepsy, migraine auras, infections, medication side effects, or certain psychiatric conditions.
In Olfactory Reference Syndrome, however, the core issue is the individual’s intense belief that they are emitting a foul odor, accompanied by mental preoccupation, shame, and avoidance behaviors. Some individuals may claim that they can detect the odor themselves; therefore, evaluation should be conducted from both a psychiatric and, when necessary, a medical perspective.
Who Is Affected by Olfactory Reference Syndrome?
Olfactory reference syndrome can occur in people of different ages and genders. Symptoms often begin to be noticed during adolescence or young adulthood; however, it is also possible for the condition to emerge in later years. Since scientific data on prevalence is limited, it is difficult to provide an exact rate regarding how common Olfactory Reference Syndrome is in the general population.
Conditions that may be associated with an increased risk:
- Fear of social judgment
- Obsessive thought patterns
- Symptoms of depression or anxiety
- Excessive focus on body image
- Previous experiences of being teased about smell, cleanliness, or the body
- Chronic stress
This information is for general informational purposes only. Not every case of fear of bad odors indicates olfactory reference syndrome.
How Does Olfactory Reference Syndrome Affect Daily Life?
Olfactory reference syndrome can significantly impact a person’s social, academic, professional, and personal life. The individual may avoid using public transportation, entering a classroom, attending meetings, speaking at close range, or forming romantic relationships. Some individuals may experience absenteeism from work or school.
Potential effects on daily life:
- Difficulty attending work, school, or social events
- Withdrawal from close relationships
- Time lost due to constant cleaning and checking behaviors
- Difficulty concentrating
- Decreased self-confidence
- Depressed mood and social withdrawal
- Repeatedly seeking medical care
In severe cases, the individual may even struggle to leave the house. Therefore, it is important to seek professional support if these symptoms are affecting the person’s quality of life.
How Is Olfactory Reference Syndrome Diagnosed?
The diagnosis of olfactory reference syndrome is made through a clinical evaluation conducted by a psychiatrist. During the consultation, the individual’s belief in having a bad odor, the amount of time spent on this belief, associated behaviors, avoidance level, insight, and functional impairment are assessed.
According to the DSM-5-TR, the defining characteristics of olfactory reference disorder include: the individual being preoccupied with the belief that they emit a bad or unpleasant body odor that is not perceived by others or is perceived only very faintly, engaging in repetitive behaviors such as self-smelling, excessive showering, changing clothes, or attempting to conceal the odor in response to this anxiety, and this condition causing significant distress or impairment.
In the ICD-11, olfactory reference syndrome is classified as 6B22 Olfactory Reference Disorder within the group of obsessive-compulsive and related disorders. ICD-11 includes subcategories based on insight level: “good/moderate insight,” “poor/no insight,” and “unspecified.”
The following points may be considered in the assessment:
- Whether there is a genuine dermatological, dental, ENT, or metabolic cause
- The likelihood of olfactory hallucinations
- Whether it is accompanied by OCD, social anxiety, body dysmorphic disorder, or depression
- The duration, severity, and impact of symptoms on functioning
- How rigid the individual’s belief is
How Is Olfactory Reference Syndrome Treated?
Treatment for Olfactory Reference Syndrome is tailored to the individual. The treatment approach may vary depending on the severity of symptoms, co-occurring mental health conditions, level of insight, and the impact on the person’s life. Therefore, treatment must be planned following an evaluation by a psychiatrist.
Possible treatment approaches:
- Cognitive-behavioral therapy (CBT)
- Exposure and response prevention techniques
- Addressing misinterpretations related to odor-related thoughts
- Reducing reassurance-seeking and control behaviors
- Medication treatment when necessary
- Assessment of comorbid depression, anxiety, or OCD symptoms
The goal of treatment for olfactory reference syndrome is to help reduce the individual’s intense thoughts about smelling bad, the control behaviors accompanying these thoughts, and social avoidance. Psychotherapy approaches such as cognitive-behavioral therapy may be used in this process. In cases deemed necessary, a psychiatrist may also evaluate medication treatment options. The decision regarding which method is appropriate should be made by evaluating the individual’s symptoms and overall mental health together.
What Happens If Olfactory Reference Syndrome Is Not Treated?
If left untreated, olfactory reference syndrome can gradually restrict the individual’s daily life. As avoidance of social settings increases, loneliness, functional impairment, and depressive symptoms may develop. The individual may frequently seek help from various medical specialties in an attempt to reduce the belief that they smell bad; however, if the issue is related to a psychological cycle, physical examinations alone may not provide lasting relief.
Possible outcomes if left untreated:
- Social isolation
- Decline in work or school performance
- Difficulty in relationships
- Increased excessive cleaning and control behaviors
- Worsening of depression and anxiety symptoms
- A significant decrease in quality of life
Since some studies have reported that severe distress and suicidal thoughts may be associated with this disorder, immediate professional help should be sought if there is hopelessness, thoughts of self-harm, or difficulty coping with daily life.
What Should People with Olfactory Reference Syndrome Do?
Individuals experiencing symptoms of olfactory reference syndrome should first understand that this is not something to be ashamed of. The anxiety they are experiencing is real, and support is available. However, constantly trying to control oneself, repeatedly seeking reassurance, or attempting to hide the odor can exacerbate symptoms in the long term.
What Can Be Done:
- Keep a record of when and in which environments the symptoms worsen
- Recognize the checking behaviors that accompany the thought of a bad smell
- Assess how social avoidance is affecting your life
- Schedule an appointment with a psychiatrist
- Seek information about psychotherapy support if necessary
- Seek non-judgmental support from close friends and family
- Avoiding attempts to self-diagnose or self-medicate online
A medical evaluation may also be necessary to determine whether the individual actually has a smell problem. However, if anxiety and compulsive behaviors persist even when medical examinations reveal no clear cause, a psychiatric evaluation is important.
Which Department Should You Visit for Olfactory Reference Syndrome?
The primary department to consult for Olfactory Reference Syndrome is psychiatry. A psychiatrist evaluates the symptoms, performs a differential diagnosis, and develops an appropriate treatment plan. If deemed necessary, support from a psychologist or psychotherapist may also be incorporated into the treatment process.
In some cases, evaluations by dermatology, otolaryngology (ENT), dentistry, gastroenterology, or neurology may be required. In particular, if there are complaints of actual odors, bad breath,
skin infections, hormonal/metabolic issues, olfactory hallucinations, or neurological symptoms, collaboration with the relevant specialties may be necessary.