If you do decide on a debt consolidation loan, make sure that you use it to pay off all your debt for good.
You are most likely considering a debt consolidation loan because you cannot afford to pay the monthly repayments on the debts you have at the moment.
If you decide to take out a debt consolidation loan, always pay your existing debts off in full. Cut up all your credit cards and cancel the agreement in writing, otherwise you might be tempted to borrow more money.
Be aware that if you do borrow more money after consolidating everything into one debt, you will have an even bigger debt problem than you started with.