current challenges discussed include ( a ) creation of physical pathology , ( b ) physical symptoms of physical pathology in the absence of true pathology , ( c ) increased or decreased vulnerability to infectious disease , ( d ) intensify , prolong , or diminish existing pathology , ( e ) individuals ' preoccupation with illness or disease , ( f ) voluntarily engaging in health-threatening behavior ( e.g. , allowing toxic agents to enter the body or engaging in accident-prone behavior or high-risk sexual practices ) , ( g ) engaging in health-enhancing life-style behaviors , and ( h ) involuntarily becoming the victim of toxic agents .
C0009450
infectious
C0012634
disease