When these sensations become more intense, this can cross over into a panic attack, which can include hyperventilation, sweating, chest tension that (seems to) mimic a heart attack, lightheadedness, derealization and several other possible symptoms.  

Stress is often what we refer to when we have an anxious reaction to a particular event (examples: an upcoming job interview, a conversation with a boss, an argument with a significant other, etc).

We all experience moments of stress (after all, we have very limited control of the world around us), but when the stress becomes either chronic (a constant state of anxiety) or it becomes overwhelming, it’s time to seek out help.