Key neurotransmitters in the anxiety experience

Communication between neurons in the brain's anxiety circuits is mediated by chemical messengers called neurotransmitters.

Imbalances in the activity of certain key neurotransmitters are involved in the generation and modulation of the anxious experience.

GABA (Gamma-Aminobutyric Acid)

GABA is the primary inhibitory neurotransmitter in the central nervous system.

Its function is to reduce neuronal excitability, producing a calming and anxiolytic effect.

Poor activity of the GABAergic system or decreased sensitivity of its receptors has been associated with a greater propensity for anxiety.

Many anti-anxiety medications, such as benzodiazepines, work by potentiating the effect of GABA, which explains their ability to rapidly reduce anxiety.

Serotonin (5-HT)

The Serotonin is a neurotransmitter with a complex and broad role in regulating mood, sleep, appetite, and anxiety.

While it is often referred to as the "happy hormone," its role in anxiety is more nuanced.

It is thought that unbalanced serotonin levels may contribute to anxiety.

Selective serotonin reuptake inhibitors (SSRIs), which increase the availability of serotonin in the synaptic cleft, are one of the first-line pharmacological treatments for many anxiety disorders, suggesting that optimizing serotonergic function may have anxiolytic effects.

Norepinephrine (Noradrenaline)

Norepinephrine is involved in the "fight-or-flight" response and in maintaining alertness and vigilance.

An overactivity of the noradrenergic system, particularly in areas such as the locus coeruleus, has been associated with increased anxiety and physical symptoms of sympathetic activation (palpitations, tremors).

Some medications used for anxiety, such as certain antidepressants (SNRIs) or beta-blockers, can modulate noradrenergic activity.

Dopamine

Although dopamine is most classically associated with the reward system and motivation, it also plays a role in anxiety.

The relationship is complex, since both too hig