How might mental illness be considered a social construct?

How might mental illness be considered a social construct?
Aim: The overall aim of this task is to enable you to demonstrate your understanding of the three key sociological paradigms (Functionalism, Conflict Theory and Symbolic Interactionalism) by applying ANY or ALL of them to an important social question/issue.(Topic question above)
Task: This task requires you to explain how ANY or ALL of the three sociological paradigms/theories (Functionalism, Conflict Theory and Symbolic Interactionalism) assist in understanding key issues in your topic.
Research your topic using a range of quality sources (e.g. peer reviewed literature, Australian Bureau of Statistics and/or other Australian government policy documents, secondary sources such as texts).
A minimum of ten references is required for this assessment.
Develop a clear argument in relation to the essay question
Support your argument with evidence (theories, research etc)