The endocrine system is a network of glands that secrete hormones to regulate bodily functions. It works alongside the nervous system to control organs and processes. The main glands include the pituitary, thyroid, parathyroid, adrenal, pineal, thymus, testes and ovaries. Hormones travel through the bloodstream to target organs, telling them what to do. Issues can arise if glands do not function properly or secrete too much or too little of certain hormones, as in diabetes where the pancreas cannot regulate blood sugar levels. Maintaining good health through rest, diet and avoiding steroids can help support the fragile endocrine system.