A trend is a pattern that occurs within the past history of a lotto game. The best way to find lottery numbers that have a high chance of hitting in the next drawing (and making you a lottery winner!) is to track the trends. There are many types of lotto number trends that can occur. Gail Howard uses 3 categories of lotto trends depending on the length of lotto history that the trends consider. These types include short term trends, medium term trends, and long term trends.