Anxiety
The National Center for Complementary and Integrative Health (2018) states that "Anxiety is a feeling of worry, nervousness, or fear about an event or situation. It’s normal for people to feel anxious in response to stress. Sometimes, however, anxiety becomes a severe, persistent problem that’s hard to control and affects day-to-day life."
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Depression
The National Institute of Mental Health (2018) states that "Depression (major depressive disorder or clinical depression) is a common but serious mood disorder. It causes severe symptoms that affect how you feel, think and handle daily activities, such as sleeping, eating or working." Some symptoms include hopelessness, pessimism, irritability or restlessness, guilt, worthlessness, loss of interest or pleasure in hobbies and activities, fatigue, lack of energy, feeling slowed down, difficulty concentrating, difficulty sleeping or oversleeping, changes in appetite or unplanned weight changes.
"Depression can happen at any age, but often begins in adulthood. Depression is now recognized as occurring in children and adolescents, although it sometimes presents with more prominent irritability than low mood. Many chronic mood and anxiety disorders in adults begin as high levels of anxiety in children."
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https://www.nimh.nih.gov/health/publications/depression
Bipolar Disorder
The National Institute of Mental Health (2020) states that "Bipolar disorder is a mental disorder that causes unusual shifts in mood, energy, activity levels, concentration and sleep. People with bipolar disorder experience periods of unusually intense emotions, changes in sleep patterns and activity levels, and uncharacteristic behavior."
"These moods range from periods of extremely “up,” elated, irritable, or energized behavior (known as manic episodes) to very “down,” sad, indifferent or hopeless periods (known as depressive episodes.)"
Please use following link to read the rest of the article:
https://www.nimh.nih.gov/health/topics/bipolar-disorder/index.shtml