Debt comes in many different forms. There are two major categories of debt though and they would be secured and unsecured debt. The difference between these two forms of debt are significant. Unsecured debt would be any money owed not connected to collateral. Credit cards, lines of credit, and personal loans would be these types of debts. Secured debt would be something along the lines of a home mortgage or a car loan. Hence, they are deemed secured because an underlying asset can be seized in the event of a default. Unsecured debt is not connected to any assets. This is not to suggest though, there will be not ramifications if unsecured debt is defaulted upon.
When you default on unsecured debt. Your credit rating will be wrecked. You also might end up being sued so the lender can recover the debt owed. Those thinking they can get away from paying unsecured debt will be in for a rude awakening.
Those with secured debt such as mortgages also face the threat of foreclosure, which is certainly not a good scenario.
Often, problems with loans derive from high interest rates. When you run your unsecured or secured debt figures through The IOU Calculator and feel your interest rates are too high, you may wish to consider refinancing. This might be the best way to get out of a bad situation and avoid problems.