There are many kinds of cat lying postures, all of which represent different meanings. Generally, when a cat is lying on its stomach with its limbs curled up, it means that it is very comfortable. If the cat is lying on its stomach with an obstruction under its belly, it may be gastrointestinal discomfort. You need to take the cat to the pet hospital immediately for examination and treatment under the guidance of a veterinarian. Pay attention to adjustments during the period. In the cat's diet, you can feed some probiotics to help the cat regulate its gastrointestinal tract.