Typical Signs of Illness ------------------------ A sick desert tortoise may exhibit obvious signs of illness, such as inappetence, runny nose, swollen eyes, and/or swollen limbs. Usually, however, signs of illness are more subtle and less obvious, such as a change of habits, lethargy, or just "acting differently." Often, by the time a tortoise begins to show obvious signs of serious illness, the disease has advanced to a life-threatening stage. Owners must, therefore, try to recognize subtle changes in behavior in their tortoises and seek veterinary care promptly when they notice any change (large or small).