Robert N. Bader, Amphibians and Reptiles in Captivity
“ One disease that is common in lizards is impaction of the intestines. This is common in insect eaters that are being fed only meal worms. Often, the impaction is not noticed until after the animal dies. If the lizard is alone, keep track of its food intake and fecal output. If an extended period goes by and the lizard is not making fecal matter, then there could be a physical blockage in the intestine. Put a little mineral oil up the cloaca—this will help to loosen the blockage. The best cure is preventive procedures. Feed a variety of insects if possible, but don’t feed all meal worms. ”
