Answer:

1. Phobia

Definition:

is a persistent, excessive, unrealistic fear of an object, person, animal, activity or situation. It is a type of anxiety disorder. A person with a phobia either tries to avoid the thing that triggers the fear, or endures it with great anxiety and distress.

2. Depression

Definition:

is a common and serious medical illness that negatively affects how you feel, the way you think and how you act. Fortunately, it is also treatable. Depression causes feelings of sadness and/or a loss of interest in activities you once enjoyed. It can lead to a variety of emotional and physical problems and can decrease your ability to function at work and at home.

3. Anxiety

Definition:

is an emotion characterized by feelings of tension, worried thoughts and physical changes like increased blood pressure. People with anxiety disorders usually have recurring intrusive thoughts or concerns. They may avoid certain situations out of worry.

4. Psychology

Definition:

is the scientific study of the mind and behavior. Psychologists are actively involved in studying and understanding mental processes, brain functions, and behavior.