What Happens in Our Brain When We Feel Anxious?
There are days when everything seems to be in order, yet the body behaves as if something is about to happen. The heart begins to race, the muscles tense, and the mind starts anticipating different scenarios. This is one of the most unsettling experiences of anxiety.
Within seconds, the mind can create an entire story about what is about to happen. Our attention begins searching for signs that confirm what we fear, making it difficult to focus on anything else.
The experience feels real because, for our brain, anticipating a threat can be enough to activate the systems designed to protect us.
In my work as a clinical psychologist, I find it especially helpful to explain that many manifestations of anxiety serve a function. Our bodies are designed to detect threats and quickly mobilize resources. The difficulty arises when this system begins responding too intensely or too frequently to situations the brain interprets as dangerous.
A Brain Designed to Anticipate
The amygdala plays a role in detecting potential threats and activating rapid protective responses. In anxiety disorders, this region may show increased activation in response to threatening or ambiguous stimuli.
This helps explain a very common experience: feeling that something is wrong before fully understanding what is happening.
Other areas of the brain help evaluate the context. The prefrontal cortex is involved in emotional regulation and helps modulate activity in the amygdala. In anxiety, communication between these systems can become disrupted.
This contributes to a characteristic feeling of anxiety: the body seems to have reached a conclusion before we have.
The Body as Part of the Anxiety Response
Anxiety occurs in the mind and is deeply expressed through the body. The sympathetic nervous system prepares the body to respond to a threat. It increases heart rate and breathing and produces physical changes that we may experience as palpitations, shortness of breath, dizziness, or gastrointestinal discomfort.
These sensations can then become a new source of worry.
A person feels their heart racing and thinks something serious is happening. That thought heightens the sense of danger. The body becomes even more activated.
Attention becomes increasingly focused on physical sensations.
This is how a cycle of anxiety can develop.
The insula plays a particularly interesting role in this process because it is involved in our perception of internal bodily sensations. When we are more sensitive to these signals, common sensations such as a racing heart or mild dizziness can be interpreted by the brain as signs of danger.
Immediate Relief Can Come at a Price
Another important factor in understanding why anxiety can persist for months or years is avoidance.
Imagine someone who begins experiencing anxiety while driving on the highway. They decide to take side roads instead and feel relieved. Over time, they begin avoiding longer drives. Eventually, they need someone else to drive.
Each decision seems reasonable when considered on its own. Taken together, however, these choices can end up teaching the brain that driving represents a threat.
Behavioral models of anxiety explain how avoidance and so-called safety behaviors provide short-term relief and, precisely because they bring relief, can become reinforced and maintain the problem. For this reason, one of the central goals of many psychological treatments is to create new learning experiences.
Our Brain Retains the Capacity to Learn
This is one of the aspects of the neuroscience of anxiety that interests me most.
The adult brain retains neuroplasticity: the ability to modify its functioning through experience and learning. The neural circuits involved in anxiety, emotional regulation, and fear can change through new experiences.
Psychotherapy draws on precisely this capacity. Exposure-based interventions seek to create new ways of relating to thoughts, sensations, and situations that previously triggered fear. Repeated experiences are part of the process through which new learning becomes established.
Understanding anxiety allows us to see it through a different lens. The brain learns from fear, from what we avoid, and from the experiences we have. Yet throughout our lives, it retains the capacity to learn something new.
Part of the work of therapy is to support that process: understanding what we have learned about danger and gradually building new ways of responding.
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