Leaving without checking can sound like a small thing from the outside. For someone who has spent a long time looking in mirrors, taking photographs, seeking reassurance, comparing, changing clothes repeatedly or returning to make sure they look acceptable, it may feel enormous. But a single moment does not establish a diagnosis, prove that someone is recovering or mean that the same step would be safe or useful for everybody. Appearance concerns and checking can have many meanings. They may be connected with anxiety, body image, trauma, bullying, a change in health, skin or hair, an injury, a medical condition, a particular social situation or something else entirely. An assessment can explore what is happening, how long it has been affecting the person, what the checking is trying to prevent, the impact on daily life and whether other professional input is needed. It should not assume body dysmorphic disorder from a brief description. If a person notices a new, changing or worrying physical feature or symptom, appropriate medical assessment matters. Emotional distress about appearance does not make a physical concern unreal, and a blog cannot distinguish a health issue from anxiety. Urgent distress, thoughts of self harm or an inability to stay safe require urgent support through 999, A&E or a crisis service. When CBT is appropriate, the work is collaborative and tailored. It may include understanding the relationship between attention, thoughts, emotions, checking, reassurance and avoidance. Behavioural work may be useful for some people, but it is not an exercise to self prescribe from a blog. A clinician helps assess suitability, plan pace, consider safety and health factors, and review what the person learns from the experience. The goal is not to force a person to ignore every concern or promise that uncertainty will disappear. It may be to make more room for relationships, work, rest and the activities that matter, while responding to discomfort with less fear and less compulsion. Progress can be uneven. A difficult day does not erase a more helpful one, and a single calmer moment does not create a deadline for future change. For related information, see CBT for body dysmorphic disorder at https://lyceumclinic.co.uk/therapy/body dysmorphic disorder/, CBT for anxiety at https://lyceumclinic.co.uk/therapy/anxiety/ and the body dysmorphic disorder clinical guide at https://lyceumclinic.co.uk/guides/body dysmorphic disorder/. The Lyceum Clinic offers assessment led CBT online and in West London, and a first conversation can help clarify what support may be appropriate.