How can breathing techniques help control anxiety?

Breathing is one of the few bodily functions that can be controlled voluntarily AND that has a direct effect on the autonomic nervous system, the system that regulates the fight-or-flight response.

Why it works: when anxious, we tend to breathe fast and shallow (hyperventilation), which lowers CO2 in the blood and worsens the physical symptoms of anxiety (dizziness, tingling, a choking sensation). Breathing more slowly and deeply reverses that process and activates the vagus nerve, triggering the relaxation response.

4-7-8 technique: inhale for 4 seconds, hold for 7, exhale for 8. The long exhale is the most important part — it activates the parasympathetic system.

Diaphragmatic breathing: inhale letting your belly expand (not your chest), exhale slowly. Place a hand on your belly for feedback; it should rise on the inhale.

Coherent breathing (5-5): inhale for 5 seconds, exhale for 5. Simpler, and just as effective for daily use.

Regular practice vs. crisis use: these techniques work best when practiced regularly during calm moments, which makes them easier to access during anxiety. Using them only during a crisis is less effective, because anxiety makes it harder to engage with the technique in the first place.