There are many reasons why basement walls crack. The most common reason is pressure. Dry spells during the summer cause the ground to dry and crack so much that it can actually push your walls and create cracks. Additionally, during rainy seasons, added weight to the ground from the rain may push your walls and create cracks as well.
There are three guarantees with concrete; 1) No one will ever steal it. 2) It will never start on fire. and 3) Eventually it will crack, therefore it is very common to see cracks in your foundation. The best thing to do is to call Eco Dry for a free professional basement evaluation.