Major depressive disorder (MDD), also known as depression, is a mental disorder characterized by at least two weeks of persistent low mood. It is often accompanied by low self-esteem, a loss of interest in normally enjoyable activities, low energy, and pain without a clear cause.
People may also occasionally have false beliefs, or see or hear things that others cannot. Some people have periods of depression separated by years in which they are satisfied with life, while for others, symptoms are nearly always present. Major depressive disorder can negatively affect a someone's personal life, work life, and education, as well as their sleeping and eating habits, and their general health.
These disorders alter how a person processes emotions and behave, as well as cause physical symptoms. Mild anxiety might be vague and unsettling, while severe anxiety may seriously affect day-to-day living.
Obsessive-compulsive disorder (OCD) is an anxiety disorder in which time people have recurring, unwanted thoughts, ideas or sensations (obsessions) that make them feel driven to do something repetitively (compulsions). The repetitive behaviors, such as hand washing, checking on things or cleaning, can significantly interfere with a person’s daily activities and social interactions.
Personality is the way of thinking, feeling and behaving that makes a person different from other people. An individual’s personality is influenced by experiences, environment (surroundings, life situations) and inherited characteristics. Someone’s personality typically stays the same over time. A personality disorder is a way of thinking, feeling and behaving that deviates from cultural expectations, and causes distress or functional problems that can last over long periods of time.