Diabetes is a lifelong (chronic) disease and is a group of metabolic disorders characterized by a high level of sugar in the blood [Hyperglycemia]. It is caused due to deficiency of insulin (diabetes insipidus) or resistance to insulin (diabetes mellitus). Insulin is secreted by β-cells of the pancreas to control blood sugar level. Both diabetes insipidus and diabetes mellitus can be treated with a variety of herbal plants, such as Tinospora cordifolia, Withania somnifera, Momordica charantia, Cinnamomum zeylanicum, Allium sativum, Panax ginseng, Gymnema sylvestre, Trigonella foenum graecum, and Azadirachta indica. Each of these medicinal plants has an anti-diabetic action, and their aqueous extracts are used to treat diabetes.