To see a cactus in your dream, suggests that you are feeling invaded, that your space is being crowded into and that you are feeling suffocated. The prickly spines of the cactus represents your wish to establish a boundary of your personal space and privacy. You need to defend yourself in some way. Alternatively, the dream implies that you have found yourself in a sticky situation. Perhaps you need to adapt to your existing circumstances instead of trying to change them.