Fear of being alone can influence ordinary decisions in ways that other people may not immediately recognise. You might arrange your day around when somebody else will be home, avoid staying overnight by yourself, ask another person to accompany you on journeys or feel unsettled when a partner, friend or family member says they are going out.

For somebody else, the difficult moment comes after the other person has left. A quiet house may suddenly feel different, ordinary noises attract more attention and thoughts about illness, panic or something going wrong can become much more convincing.

You may still remain alone when necessary, but doing so can require continuous calls, messages, television, background noise or checking that somebody is available if you need them. The fact that you managed the situation does not show how much effort it required.

Being alone or anticipating it can bring a rapid physical response. You might notice:

• A racing or noticeably stronger heartbeat
• Shaking, sweating or a rush of heat
• Tightness in your chest or changes in breathing
• Nausea, dizziness or light-headedness
• Restlessness and difficulty settling
• A strong urge to contact somebody or leave

Physical sensations can become especially difficult if your fear includes the thought that something might happen to you when nobody is there to help.

A normal change in heartbeat or a moment of dizziness may then become “What if something is wrong and I am here on my own?” The sensation receives more attention because being alone changes what you imagine would happen next.

New, unexplained or persistent physical symptoms should not automatically be attributed to anxiety and may need appropriate medical assessment.

The fear can centre on very different predictions.

You may worry about:

• Having a panic attack without support
• Becoming ill, fainting or having a medical emergency
• An accident happening at home
• Somebody entering the house
• Feeling overwhelmed and being unable to calm yourself
• Nobody answering if you need help
• Being abandoned or left permanently
• Not knowing what to do without another person nearby

For some people, the fear is less about a specific catastrophe and more about a powerful feeling that they are simply not safe when nobody else is present.

Understanding the particular expectation is useful because being alone and believing you cannot cope alone are not the same experience.

Monophobia can influence how you maintain contact with other people.

You might:

• Call or message repeatedly when alone
• Keep somebody on the phone while completing ordinary tasks
• Check when another person will return
• Ask somebody to stay overnight
• Arrange to be in public places so you are not physically alone
• Avoid travelling or staying somewhere without a companion
• Keep television, music or other background sound on continuously
• Sleep only when somebody else is in the house

Some of these things may simply be preferences. Many people enjoy background sound, regular contact and company.

The useful distinction is whether they are choices that add comfort or conditions you feel unable to manage without.

The effect of monophobia can be easier to recognise in the choices it removes.

You may stay in situations or relationships because being alone feels worse, turn down opportunities that involve independent travel, avoid living by yourself or organise evenings around whether somebody else will be available.

For someone else, most activities remain possible, but a considerable amount of attention goes into ensuring that another person can be reached.

A useful question is:

What would I be doing differently if being alone felt safer and more manageable?

Perhaps you would spend an evening at home comfortably, sleep alone, travel independently or let somebody you care about go out without needing constant reassurance about when they will return.

Those everyday changes can describe what you want much more clearly than a fear score.

You do not need to prove that you can spend a certain number of hours alone before asking for help.

One recent example can be enough: what was happening, what you expected, what you noticed in your body, what you did to feel safer and what you would have preferred to be able to do.

That gives treatment a practical direction.