Cats may stick their tongues out because the ambient temperature is high. Cats use their tongues to dissipate heat, especially white cats or cats with light-colored fur, as their fur absorbs more heat, making it easier for them to cool down by sticking their tongues out.

The cat may be sick. In this case, it is recommended to take its temperature and observe whether the cat's appetite is normal. If there are abnormal symptoms such as lethargy and decreased appetite, it is necessary to take it to the veterinary hospital for examination in time.
Cats will also stick out their tongues after strenuous exercise to increase their oxygen intake and help their bodies dissipate heat as their body temperature rises.