A mentally healthy person can maintain self-esteem, fulfill relationships, realize their potential, and cope with life stresses. Mental health refers to a state of well-being where one can be productive, make contributions, and maintain mental and interpersonal functioning, even amidst change or stress. Mental illness occurs when this state of physical, mental, social, and spiritual well-being is disturbed, resulting in symptoms like depression or anxiety that impair daily life. Mental illness has biological, psychological, social, and physiological causes.