Why does craving cause suffering?

In my opinion the main reasons why craving causes suffering is due to the fact that one can't always get what they want. Hence that creates mental or physical issues for you. Since one cannot attain the object or thing they are looking for, a will to try harder and harder will come into existence. This may bring pain to you since not all things can be attained without pain. The Buddha knew that humans …

…mind-objects, in the consciousness, sense impression, perception, will, craving, thinking, and reflecting. When an object is perceived to be pleasant one is attracted to it. But if it is found unpleasant one is repelled from it. Present suffering accumulates when people indulge in sensuous craving that lead to various forms of conflicts and quarrels or wicked acts like stealing, robbery or seducing the wives of others which results either in deadly pain or in death.