A change in circumstance can work a hardship on either partner in a divorce -- the custodial and the noncustodial parent.
After a divorce, courts frequently entertain motions for a change in the amount of support works a hardship.
In divorce and family law, the term hardship is sometimes applied in connection with a continuing -- and extraordinary -- expense that exceeds everyday expenses and must be apportioned in some fairer way. For example, the cost of medical custodial parent, would be said to "work a hardship" if she or he is asked to pay it alone.
Courts have latitude in dealing with claims of hardship because the term is qualitative, although the dollar amounts are quantitative.
See also Change in Circumstance.