Reference

Understanding anxiety

Anxiety is a normal threat-response system that helps the body and brain detect potential danger.
It can involve physical sensations, worried thoughts, behavioral changes, or a combination of these.

In many people, anxiety is driven less by immediate danger and more by uncertainty, anticipation, or the interpretation of risk.

Key points

• Anxiety evolved to protect, but it can activate when no immediate danger is present.
• Physical symptoms are common because anxiety alters breathing, heart rate, muscle tension, digestion, and attention.
• Anxiety often persists through reinforcing cycles such as avoidance, checking, reassurance seeking, and threat interpretation.

What anxiety is

Anxiety reflects the nervous system preparing for possible threat.
It is closely related to fear, but fear typically responds to immediate danger,
while anxiety more often involves anticipation, uncertainty, or perceived risk.

See What is Anxiety.

Anxiety becomes clinically significant when it is frequent, difficult to regulate,
or interferes with daily functioning such as sleep, work, relationships, or health.

Common symptoms and signs

Assessment and context

Assessment typically considers symptom patterns, duration, triggers, avoidance behaviors,
functional impact, and safety concerns.
Medical evaluation may be used to rule out conditions that can resemble anxiety.

If symptoms are primarily physical, see
Why anxiety feels physical.
If symptoms involve sudden surges of fear, see
Panic.
If symptoms center on illness concerns and reassurance cycles, see
Health anxiety.

Related reading

• Body-based vs mind-based anxiety
• Why anxiety feels physical
• Panic
• Health anxiety
• Stress and burnout

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