1 Cold sores later crust over with a scab and are usually associated with tingling, tenderness, or burning before the actual sores appear. 2  Mouth irritation. 3  The irritation can be caused by: 4  Biting your cheek, tongue, or lip. 5  Wearing braces or another type of dental apparatus, or having a sharp, broken tooth.
Main Image: The Pituitary gland is a pea-sized endocrine (hormone-producing) gland weighing about 0.5 g situated at the bottom of the skull sandwiched between the optic nerves, in humans. The pituitary gland secretes hormones. Hormones are chemicals that travel through the blood stream.
PROLACTIN: A MILK-PRODUCING HORMONE. Prolactin is a hormone secreted by the pituitary gland which is located at the base of the brain. It circulates in low levels in the bloodstream of non pregnant women.During pregnancy, prolactin levels increase approximately ten-fold and stimulate milk formation.ROLACTIN: A MILK-PRODUCING HORMONE. Prolactin is a hormone secreted by the pituitary gland which is located at the base of the brain. It circulates in low levels in the bloodstream of non pregnant women.