Fainting may have a variety of causes. A simple episode, also called a vasovagal attack or neurally-mediated syncope, is the most common type of fainting spell. It is most common in children and young adults. A vasovagal attack happens because blood pressure drops, reducing circulation to the brain and causing loss of consciousness.
Diabetes mellitus type 1. Diabetes mellitus type 1 (also known as type 1 diabetes) is a form of diabetes mellitus in which not enough insulin is produced. The lack of insulin results in high blood sugar levels. The classical symptoms are frequent urination, increased thirst, increased hunger, and weight loss.
1 Type 1 diabetes can occur in an older individual due to destruction of the pancreas by alcohol, disease, or removal by surgery. 2  It also results from progressive failure of the pancreatic beta cells, the only cell type that produces significant amounts of insulin. Type 1 diabetes involves about 10% of all people with diabetes in the United States. 2  Type 1 diabetes is typically diagnosed during childhood or adolescence. 3  It used to be referred to as juvenile-onset diabetes or insulin-dependent diabetes mellitus.