Bipolar disorder causes episodes of extreme mood swings, from emotional highs (mania) to depression, that affect day-to-day functioning. These shifts can last for hours, days or weeks and are not the same emotional ups and downs that most people experience.

Clinical depression, or major depressive disorder, is characterized by persistent feelings of sadness, loss of interest in daily activities and negative changes in sleep, appetite, energy and concentration.

Generalized anxiety disorder causes persistent, ongoing worry that is hard to control and disrupts daily life. This condition can cause physical symptoms such as fatigue, muscle aches and difficulty sleeping.

OCD is a mental health condition that causes patterns of unwanted and repeated thoughts and fears (obsessions). These thoughts may lead to repetitive behaviors (compulsions). The obsessions and compulsions are uncontrollable and may cause significant disruption to daily life.

A panic attack is a sudden feeling of intense fear accompanied by severe physical symptoms like dizziness or difficulty breathing. When experiencing a panic attack, people may think they are having a heart attack, losing control or dying.

Panic disorder occurs in people who have had multiple unexpected panic attacks and experience significant, ongoing anxiety about having another.

PTSD is a result of experiencing or witnessing a traumatic event. Those with PTSD often relive the traumatic event through flashbacks or nightmares and avoid places or situations that may remind them of the incident. PTSD can cause severe depression and anxiety, as well as physical symptoms such as being easily startled, feeling tense or having difficulty sleeping.

Social anxiety disorder is a condition in which social interactions cause significant anxiety. Those with social anxiety disorder may experience fear of being observed or judged by others and avoid being around other people as a result.