The tenure of a typical mortgage is usually very long, spanning 15 to 20 years at least. It is extremely possible that within this long span of time, the conditions in the financial market change and mortgages become available at much lower interest rates. This may be a good time for you to consider refinancing your loan and taking advantage of lower interest rates.
In most cases, it is possible to approach the same lender that you have taken the mortgage from and renegotiate the terms of the loan with lower interest rates. If you find that this is not possible, you could consider the option of changing lenders and approaching another lender who can give you a better deal on your balance mortgage. However, changing lenders will require some research on your part to find the best deal. Also keep in mind that when you take a new mortgage, you will be required to pay some additional charges towards processing the loan.
When you refinance your loan, you can choose to lower your monthly repayment amount and stick to the same tenure you had with your original loan. This may go a long way in helping you manage your monthly finances. On the other hand, you could choose to pay the same amount you are currently paying and reduce the tenure of the loan. This will help lower the interest rates applied to the loan and you would end up saving a lot of money that you would otherwise have paid as interest on the loan.