What's the difference?
Stress is the body’s reaction to various stimuli, including physical, chemical, emotional, or environmental factors. Stress is a normal part of life and something that everyone experiences.
Acute stress is short-lived and involves the body releasing adrenaline and cortisol, which helps you respond quickly when needed (e.g., when you encounter something dangerous). Chronic stress, however, results in ongoing high levels of stress hormones that can compromise your immune system and cause severe health problems such as depression.
Stress, whether acute or chronic, is not diagnosed as a mental health disorder.
The experience of anxiety is more similar to fear. This may be fear of something specific or fear that doesn’t seem to have a cause. Many people experience anxiety in relation to common stressful events such as exams or upcoming submission deadlines, and this anxiety can be short-lived. However, when anxiety continues and begins to interfere with ongoing daily functioning it is diagnosed as an anxiety disorder.