Stop biting your nails — the habit you don’t notice, and the method to tackle it

Stopping nail-biting is difficult for one simple reason: it usually happens without you realising it. Your hand finds its way to your mouth whilst you’re reading, watching TV or thinking about something else, and by the time you realise it, it’s already happened. That’s precisely why there’s a specific method for this sort of habit, known as habit reversal, and it’s well supported by research. It’s based on two parts: becoming aware of the habit the moment it starts, and having a counter-action ready.

A habit without a decision

Most habits start with a trigger and then run their course of their own accord. Nail-biting is an extreme example. It is such an ingrained and subtle behaviour that it can go on for a long time before it reaches your consciousness. Many people who bite their nails only realise they’re doing it when it starts to hurt, or when someone points it out.

Nail-biting is usually classified as part of a group of behaviours known as body-focused repetitive behaviours, which also include hair-pulling and skin-picking. What they have in common is that they often occur when one is bored, stressed or concentrating, and that they provide brief relief or satisfaction — which is why they are repeated.

The method: habit reversal

In the 1970s, psychologists Nathan Azrin and Gregory Nunn developed a method known as ‘habit reversal training’. In Swedish, it is sometimes referred to as ‘vanebändning’. Since then, it has become one of the most widely used methods for treating precisely this type of habit.

A systematic review by Bate and colleagues found that habit reversal was effective for several such behaviours, including tics and hair-pulling. Most of this research relates to treatment with a therapist, so the results should not be directly applied to doing it on your own. However, the principles are simple enough to try for yourself.

Step 1: become aware

The first step is to learn to notice the habit as early as possible. It’s harder than it sounds, as the whole problem is that it happens without you realising it.

Describe the movement in detail. Which hand? Which finger? Does it start with you bringing your hand towards your face, feeling an uneven nail, or resting your chin in your hand? Every step before the actual biting is a chance to catch it.

Identify when it happens. In what situations, in what places, and when you’re feeling a certain way. Most people find two or three typical situations — in front of a screen, in a meeting, in the car. How to identify such clues more generally is described in the article on the triggers behind habits.

Keep a tally. Write down every time you notice you’re biting your nails or about to do so. Simply doing this increases your awareness, and often reduces the habit somewhat in itself.

Step 2: a counter-action

The second step is to have something else to do instead – something that is impossible to do whilst biting. Classic examples include loosely clenching your fist, placing your hands on your lap, or holding onto something – a pen, or a stone in your pocket.

When you notice your hand moving towards your mouth, or the urge coming on, carry out the counter-action and hold it there for a while, until the urge has subsided. It’s the same principle as ‘riding a craving’: the urge rises and falls if you don’t act on it, something described in more detail in the article on managing cravings and urges.

Step 3: support and reminders

The method often involves support from someone around you — a person who kindly points out when you’re biting and encourages you when you’re doing well. This isn’t to monitor you, but to help you notice what you’d otherwise miss.

Bitter-tasting nail varnish and short nails can also help, but mainly as reminders. They provide a signal when your hand reaches your mouth, but they do not eliminate the habit. Without awareness and a substitute action, nail-biting will often return once the varnish has worn off.

When nail-biting becomes a bigger problem

For most people, nail-biting is a minor annoyance. For some, it causes sores, infections or a great deal of shame, and is sometimes linked to other behaviours such as hair-pulling or skin-picking. In such cases, it is worth discussing this with your healthcare provider. Habit modification with the support of a therapist is well-supported, and there is no need to feel ashamed about seeking help for this.

The broader approach to breaking habits — replacing rather than simply eliminating — is outlined in the guide on breaking a habit.

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The Zenith Protocol is a 30-day impulse control programme that trains you to manage the moment when an impulse turns into an action. It’s free to get started.