Lenders aren’t too thrilled to see a lot of newly issued credit in your credit history. If you’ve gone years with one credit card and one car loan and suddenly have those plus four new credit cards and a student loan, lenders will be concerned about your ability to pay off all this new debt and will be less likely to loan you money.
Even applying for new credit can have a very slight negative effect on your credit score. It’s possible to lose a point or two each time a lender inquires into your credit history. Again, the best policy is to use one or two credit cards for the very long term and apply for new credit only when you really need it.