20.8 — Anxiety Disorders

The treatment that works best for anxiety is the one that feels most wrong: doing the thing you are afraid of, deliberately, without the safety measures, until your body learns it was not dangerous.

Everything else in this chapter is detail around that finding.

Anxiety disorders are the commonest mental health conditions in the world, affecting around 300 million people, and they respond to treatment as well as almost anything in medicine.

What anxiety is for

The fear response is a survival system, and it works well.

A threat is detected — often by the amygdala, before conscious awareness (Chapter 11.6). The sympathetic nervous system fires. Adrenaline is released (Chapter 12.4).

Heart rate rises to move blood faster. Breathing speeds up. Blood is diverted from the gut and skin to the muscles. Pupils widen. Digestion stops.

Which is exactly what you want when facing something dangerous, and exactly what produces every physical symptom of a panic attack when there is nothing to face.

Racing heart, breathlessness, chest tightness, nausea, dizziness, sweating, trembling, tingling in the hands and around the mouth. Every one of them is the survival system doing its job at the wrong moment.

Understanding that is itself part of treatment, because a person who knows their heart is racing because of adrenaline is far less frightened than one who thinks it means a heart attack — and the fear of the symptoms is what drives the escalation.

When it becomes a disorder

Three tests: it is out of proportion to the actual threat; it persists; and it changes what the person does — avoiding places, situations, or activities.

And avoidance is the mechanism that keeps it going, which is the key insight of the whole field.

Here is why. You avoid the situation. Your anxiety drops immediately, which feels like relief and teaches your brain that avoiding worked. But you never find out that the feared thing would not have happened. So the belief survives intact, and the next encounter is worse.

Every anxiety disorder runs on this loop, and every effective treatment breaks it in the same way.

The disorders

Generalised anxiety disorder — persistent worry across many areas, most days for six months or more, with restlessness, fatigue, poor concentration, irritability, muscle tension and disturbed sleep.

The distinguishing feature is that the worry moves. Resolve one and it attaches to the next. People frequently describe it as their mind never being off.

Panic disorder — recurrent unexpected panic attacks, plus persistent fear of having another.

A panic attack peaks within about 10 minutes and subsides. It is intensely unpleasant and it is not dangerous. Nobody has died from a panic attack.

And the second part is the disorder — the fear of the attacks leads to avoiding anywhere they might occur, which is how agoraphobia develops. Agoraphobia is not fear of open spaces; it is fear of being somewhere escape would be difficult if panic came, which is why supermarkets, buses, cinemas and bridges are typical.

Social anxiety disorder — fear of scrutiny and negative judgement.

Not shyness. It leads to avoiding speaking up, eating in front of others, using public toilets, or attending events, and it frequently shapes entire careers. Typically begins in adolescence and goes untreated for over a decade on average, which is a striking figure for such a treatable condition.

Specific phobias — heights, flying, needles, dogs, enclosed spaces, vomiting.

And blood-injection-injury phobia is different from all the others: it produces a drop in blood pressure and fainting rather than the usual rise. Which is why the treatment includes applied tension — deliberately tensing the muscles to raise blood pressure — the opposite of the relaxation used everywhere else.

Obsessive-compulsive disorder — intrusive unwanted thoughts causing distress, and repetitive behaviours performed to reduce it.

And it is widely misunderstood. It is not liking things tidy. The intrusive thoughts are frequently violent, sexual or blasphemous, and horrifying to the person having them precisely because they are against everything that person values. Which is why so many people never disclose them for years.

The compulsion is a temporary relief that strengthens the cycle — the same loop as avoidance.

Treatment is exposure with response prevention — encountering the trigger and not performing the compulsion. Plus SSRIs, which work in OCD at higher doses and over longer periods than in depression.

Post-traumatic stress disorder — following exposure to trauma.

Re-experiencing — flashbacks and nightmares, and a flashback is not a memory; it feels like the event is happening now, because the memory was encoded without the usual time-stamping.

Avoidance of reminders. Hyperarousal — startle, vigilance, poor sleep. And negative changes in mood and belief.

Treatment: trauma-focused CBT and EMDR, both with good evidence. Medication is second line. And critical incident debriefing immediately after trauma does not help and may cause harm, which reversed decades of practice.

Health anxiety — persistent fear of serious illness, sustained by checking, reassurance-seeking and searching symptoms online. Reassurance works for hours and strengthens the loop, which is why the treatment involves reducing checking rather than providing more tests.

The physical mimics

And these must be excluded, because they present identically.

Overactive thyroid — palpitations, tremor, sweating, weight loss, heat intolerance (Chapter 12.3).

Cardiac arrhythmia — particularly if palpitations start and stop abruptly and precede rather than follow the fear.

Low blood sugar (Chapter 18.7).

Phaeochromocytoma — a rare adrenaline-secreting tumour, producing episodic attacks with severe high blood pressure. Rare, and worth knowing because it is curable.

Caffeine. A genuinely common cause, and frequently missed — high intake produces the full picture, and people rarely count it.

Alcohol and drug withdrawal.

Asthma, and medications including salbutamol, steroids and decongestants.

A useful discriminator: anxiety symptoms usually follow a thought or a situation; a physical cause usually arrives first and the fear follows it.

Treatment

Cognitive behavioural therapy is first line for every anxiety disorder, and it is more effective than medication in the long run because the learning persists after treatment stops.

The core components:

Understanding the mechanism — that the symptoms are adrenaline, that panic peaks and falls, that avoidance is the fuel.

Exposure, graded and repeated. Approaching the feared situation, staying until the anxiety comes down on its own, and repeating until the brain updates its prediction.

And dropping the safety behaviours, which is the part that gets missed. Carrying the water bottle, sitting near the exit, having a friend present, keeping the medication in your pocket unopened — each one lets the brain conclude "I was fine because I had that", so the fear survives.

Cognitive work — testing the predictions rather than arguing with them. The evidence that a prediction is wrong is more convincing than any reassurance.

Interoceptive exposure for panic — deliberately producing the physical sensations, by breathing fast, spinning, or breathing through a straw, so the sensations themselves stop being frightening.

Medication.

SSRIs and SNRIs are first line, and the same rules apply as in depression (Chapter 20.7): start low, expect an initial increase in anxiety for the first week or two, wait 4 to 6 weeks for benefit, and continue for 6 to 12 months after recovery.

Starting at a lower dose than for depression is standard, because the early jitteriness is what makes people stop.

Propranolol — blocks the physical symptoms without touching the mental ones. Useful for performance situations, and it does not treat the underlying disorder.

Benzodiazepines, and this needs stating clearly.

They work immediately and they work well, which is exactly the problem. Tolerance develops within weeks, dependence follows, and withdrawal is unpleasant and sometimes dangerous.

And there is a subtler harm: taking one during an exposure prevents the learning. The brain concludes it survived because of the tablet, so the fear does not extinguish — which means the drug that gives the most relief in the moment is the one that most reliably prevents recovery.

Short-term use in a crisis is reasonable. Regular use for an anxiety disorder is not.

Pregabalin — effective for generalised anxiety, and with its own dependence potential.

What helps day to day

Exercise — good evidence, and it also provides a harmless dose of the same physical sensations, which reduces the fear of them.

Sleep — anxiety and insomnia drive each other (Chapter 20.11).

Reducing caffeine and alcohol. Alcohol reduces anxiety for a few hours and raises it markedly the next day, so drinking to manage anxiety reliably worsens it.

Slow breathing — breathing out for longer than you breathe in activates the parasympathetic system (Chapter 11.9), which physically slows the heart. Around 6 breaths a minute.

And it is used as a coping tool with one caution: if it becomes a safety behaviour done to prevent a catastrophe, it feeds the loop. The distinction is whether it is used to get through a situation or to avoid finding out the situation was safe.

Mindfulness-based approaches have reasonable evidence, particularly for relapse prevention.

Worry time — deliberately scheduling 20 minutes a day for worry and postponing it otherwise. Simple, oddly effective, and well supported for generalised anxiety.

And reducing reassurance-seeking, which includes asking people repeatedly whether it will be fine and searching symptoms online. Both work briefly and strengthen the cycle.

Why this chapter is optimistic

Anxiety disorders have the best treatment response rates in mental health.

Specific phobias can be resolved in a single extended session in a substantial proportion of cases.

Panic disorder responds to CBT in around 80 percent.

And the mechanism is understood well enough that treatment is not guesswork — the loop is known, and breaking it works.

The main obstacle is not effectiveness. It is that the treatment asks people to do the thing they have organised their life around not doing — which is why it works far better with a therapist, a plan, and a gradual ladder than alone.

What the next page fixes

Chapter 20.9 covers bipolar disorder and schizophrenia — the conditions most distorted by public perception, and the ones where accurate knowledge changes outcomes most.