Cortisol, also known as hydrocortisone, is a hormone released by the adrenal gland in response to stress. When responding to a stressful situation cortisol prepares the body for a fight or flight response by increasing blood sugar, suppressing the immune system, and aiding in fat, protein and carbohydrate metabolism for increased energy. Cortisol also prevents the release of substances that cause inflammation so it is used to treat diseases that cause inflammation such as rheumatoid arthritis and allergies. Although cortisol is critical for our survival, too much cortisol is damaging to the body and can cause hyperglycemia, abdominal fat production, obesity, decreased bone density, compromised immune and inflammation response, increased blood pressure, damage to the heart, and may lead to Cushing’s syndrome. Too little and our bodies don’t function properly either. Damage to the adrenal gland or an autoimmune disease can reduce the amount of cortisol produced leading to weight loss, fatigue, low blood pressure, vomiting, diarrhea and loss of consciousness.