Stress is any demand placed on your brain or physical body. People can report feeling stressed when multiple competing demands are placed on them. The feeling of being stressed can be triggered by an event that makes you feel frustrated or nervous. Anxiety is a feeling of fear, worry, or unease.
There’s a fine line between stress and anxiety. Both are emotional responses, but stress is typically caused by an external trigger. The trigger can be short-term, such as a work deadline or a fight with a loved one or long-term, such as being unable to work, discrimination, or chronic illness. People under stress experience mental and physical symptoms, such as irritability, anger, fatigue, muscle pain, digestive troubles, and difficulty sleeping.
Anxiety, on the other hand, is defined by persistent, excessive worries that don’t go away even in the absence of a stressor. Anxiety leads to a nearly identical set of symptoms as stress: insomnia, difficulty concentrating, fatigue, muscle tension, and irritability.