Some people with high levels of cortisol in their blood do not show the typical physical signs of Cushing's disease, such as weight gain or bruising, which may be due to their bodies converting less cortisone into active cortisol in tissues.

After surgery to treat Cushing's disease, some patients show very low levels of cortisol in the blood, reduced ability to convert cortisone to cortisol, and faster clearance of cortisol from the bloodstream, suggesting a partial deficiency in the enzyme 11beta-HSD1.

In people with Cushing's disease, a specific ratio of steroid metabolites in urine is lower than normal, which suggests that the enzyme responsible for activating cortisone into cortisol is not working fully.

When someone has too much cortisol (the stress hormone) in their body, like in Cushing syndrome, the fat builds up in the belly area but disappears from arms and legs, giving them a distinctive body shape with a big belly and skinny limbs.

In adults who have recovered from Cushing’s disease, following a daily eating schedule from 10 a.m. to 6 p.m. for 12 weeks is linked to a substantial decrease in cortisol levels in urine, which may reflect changes in the activity of the stress hormone system.

When your body is under long-term stress and makes too much cortisol, it starts using the same building blocks to make more stress hormones instead of sex hormones like testosterone and estrogen.