Under certain circumstances, you can receive a deferment or forbearance on your loan, as long as it’s not in default. During a deferment, no payments are required. You won’t be charged interest for a subsidized FFEL or Direct Stafford loan. If you have an unsubsidized Stafford Loan, you are responsible for the interest during deferment.
If you’re temporarily unable to meet your repayment schedule (for example due to poor health or other unforeseen personal problems), but you’re not eligible for a deferment, your lender might grant you forbearance for a limited and specified period.
(Source: Studentaid.ed.gov)