A fear of spiders can begin affecting ordinary parts of life long before there is a spider directly in front of you. You may hesitate before opening a cupboard, check a room before settling down or feel less comfortable using a shed, loft or garden. Sometimes the hardest part is not the sighting itself, but knowing that a spider was there and no longer knowing where it is.

That can be particularly frustrating when one part of you understands that there is little danger while another part reacts as though something urgent is happening.

A spider sighting can produce a very quick physical response. You might notice:

• A racing heart, trembling or a sudden rush of heat
• Tight muscles, nausea or a skin-crawling sensation
• An urge to pull away, leave immediately or freeze on the spot

The body can react before you have decided what you actually want to do. You may know the spider is across the room and still feel as though you need to respond immediately. The intensity of that feeling does not tell you how dangerous the spider is. It tells you how strongly your automatic response has interpreted the situation.

Spider fear is not always centred on being bitten. For one person, the strongest concern may be the spider coming closer. For another, it may be the thought of legs touching their skin, a spider getting into clothing or not knowing where it has gone.

Disgust can be just as important as fear. That is why reassurance such as “it cannot hurt you” may not settle somebody whose actual difficulty is contact, movement or revulsion.

Not knowing where a spider has gone can be particularly consuming. Your attention may keep returning to small movements, shadows or sensations from your clothing even after the sighting has ended.

You also do not have to appear frightened for the experience to be difficult. You might stay in the room and continue talking while a large part of your attention remains fixed on the spider. Someone else may see you coping without seeing how much effort that requires.

Spider fear can gradually create routines that make everyday spaces feel safer. You may find yourself:

• Shaking out towels or checking shoes before using them
• Inspecting a bedroom before getting into bed
• Avoiding a shed, loft or room where you previously saw a spider
• Asking somebody else to search a space or remove a spider

The important distinction is not whether you ever check. Most people make ordinary choices about things they dislike. The more useful question is whether you choose to check or feel that you have to check before you can settle or continue.

One quick look is different from searching repeatedly because the feeling of uncertainty has not gone away.

Disliking spiders does not automatically mean you have arachnophobia. You might prefer not to touch one and otherwise give spiders very little thought. A more restrictive fear begins having influence beyond that preference.

The cost might be the sleep you lose after a sighting, a room you stop using comfortably, an overnight visit you avoid or the amount of attention spent scanning your own home. Sometimes that tells you more than the strength of the immediate reaction.

A useful question is: What would I be doing differently if spider fear had less influence?

Perhaps you would get into bed without searching first, open the window without thinking about what might come inside or deal with a sighting and then return to your evening. Those everyday changes can describe the problem, and the goal, much more clearly than an anxiety score.

You do not need a perfect explanation of why the fear began before discussing it with somebody. One recent example can be enough: what happened, what stood out, what you found yourself doing and what you would have preferred to be able to do instead. That gives treatment something practical to connect with.

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