Anxiety is both a mental and physical state of negative expectation. Mentally it is characterized by increased arousal and apprehension tortured into distressing worry, and physically by unpleasant activation of multiple body systems—all to facilitate response to an unknown danger, whether real or imagined.

The cognitive feelings of dread in anticipation of some bad outcome and physical sensations such as jitteriness and a racing heart are designed for discomfort. Anxiety is meant to capture attention and stimulate you to make necessary changes to protect what you care about. Occasional bouts of anxiety are natural and can even be productive. Anxiety can be considered the price we humans pay for having the ability to imagine the future.

Learn more: https://www.psychologytoday.com/us/basics/anxiety

"The grey drizzle of horror," author William Styron memorably called depression. The mood disorder may descend seemingly out of the blue, or it may come on the heels of a defeat or personal loss, producing persistent feelings of sadness, worthlessness, hopelessness, helplessness, pessimism, or guilt. Depression also interferes with concentration, motivation, and other aspects of everyday functioning.

According to the World Health Organization, depression is the leading cause of disability worldwide. Globally, more than 300 million people of all ages suffer from the disorder. And the incidence of the disorder is increasing everywhere. Americans are highly concerned with happiness, yet they are increasingly depressed: Some 15 million Americans battle the disorder, and increasing numbers of them are young people.

Depression comes in forms ranging from major depression to dysthymia and seasonal affective disorder. Depressive episodes are also a feature of bipolar disorder.

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https://www.psychologytoday.com/us/basics/depression

Anger is one of the basic human emotions, as elemental as happiness, sadness, anxiety, or disgust. These emotions are tied to basic survival and were honed over the course of human history.

Anger is related to the “fight, flight, or freeze” response of the sympathetic nervous system; it prepares humans to fight. But fighting doesn't necessarily mean throwing punches. It might motivate communities to combat injustice by changing laws or enforcing new norms.

Of course, anger too easily or frequently mobilized can undermine relationships or damage physical health in the long term. Prolonged release of the stress hormones that accompany anger can destroy neurons in areas of the brain associated with judgment and short-term memory, and weaken the immune system.

For those who struggle with chronic anger, or for those who only experience occasional outbursts, learning skills to identify and navigate this powerful emotion can lead to growth and change.

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https://www.psychologytoday.com/us/basics/anger