Mental health is a state of a person's emotional, psychological, and social well-being. It affects how a person thinks, feels, and behaves, and affects their ability to cope with the challenges of daily life. Mental health can be influenced by many factors, including genetics, environment, and life experiences. Mental illnesses are common and range from mild to severe, including anxiety disorders, depression, bipolar disorder, schizophrenia, and personality disorders. These conditions can seriously impact a person's quality of life, relationships, and ability to perform at work or school. Treatment for mental illness may include a combination of medications, psychotherapy, and lifestyle changes. In some cases, hospitalization may be required for people experiencing a mental health crisis.