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What is anxiety?

Anxiety is a natural response of the nervous system that prepares the body and mind to detect and respond to potential threat. It can involve both mental processes, such as worry or anticipation, and physical responses, such as increased heart rate, tension, and changes in breathing.

Anxiety is not inherently harmful. It becomes a concern when it is persistent, disproportionate to the situation, or begins to interfere with daily functioning. For a broader breakdown of symptoms, see anxiety symptoms.

How anxiety works

Anxiety is driven by the brain’s threat-detection system. When something is perceived as uncertain, risky, or potentially harmful, the body activates a coordinated response designed to prepare for action.

This response is closely tied to the release of stress hormones, changes in breathing, muscle activation, and increased attention to the environment or internal sensations.

These processes explain why anxiety often feels physical, as described in why anxiety feels physical and can anxiety cause physical symptoms.

Body-based vs mind-based anxiety

Anxiety can be understood through two primary patterns: body-based activation and mind-based activation.

• Body-based anxiety: physical sensations lead the experience, such as heart rate changes, dizziness, or shortness of breath (see body vs mind anxiety)
• Mind-based anxiety: thoughts lead the experience, such as worry, overthinking, or anticipation (see overthinking and anxiety and rumination and anxiety)

Many people experience a combination of both patterns, where physical sensations trigger thoughts and thoughts increase physical activation.

Common symptoms of anxiety

Anxiety symptoms can vary widely but often include both mental and physical components.

Mental symptoms

• Persistent worry or overthinking
• Rumination or repetitive thinking
• Catastrophizing and worst-case thinking
• Intrusive thoughts
• Difficulty concentrating or decision-making

Physical symptoms

• Heart palpitations
• Chest pain
• Shortness of breath
• Dizziness
• Nausea
• Fatigue
• Brain fog
• Tingling

These symptoms are part of the body’s response to perceived threat, even when no immediate danger is present.

Anxiety vs stress vs panic

Anxiety is often confused with stress or panic, but these are related but distinct experiences.

• Stress vs anxiety – stress is often tied to a specific external demand
• Panic attacks – sudden, intense surges of fear and physical symptoms
• Panic vs anxiety – differences in intensity and duration

Understanding these distinctions can help clarify why anxiety may feel constant while panic feels sudden and intense.

Types of anxiety

Anxiety can present in different forms depending on the underlying pattern.

• Generalized anxiety disorder (GAD)
• Panic disorder
• Social anxiety disorder
• Health anxiety
• Obsessive-compulsive disorder (OCD)

Why anxiety can feel constant

Anxiety can feel ongoing when the nervous system remains activated over time. This may be influenced by chronic stress, sleep disruption, or ongoing uncertainty.

These patterns are explained further in why anxiety comes in waves and stress and burnout.

Does anxiety go away?

Anxiety often improves over time, but it does not typically disappear completely. Instead, recovery involves reduced intensity, frequency, and impact.

Learn more in does anxiety go away and anxiety recovery timeline.

When anxiety may need attention

• Symptoms are persistent or worsening
• Anxiety interferes with daily life
• Frequent panic attacks occur
• Sleep, mood, or health are affected

In these cases, additional support may be helpful. See when to seek help for anxiety.