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.
Most hormones in the human body are produced by organs called ductless glands (endocrines). These include the two adrenal glands, the pituitary gland, the four parathyroid glands, the sex glands, and the thyroid gland.arious endocrine glands secrete hormones into the blood, which carries them throughout the body. When a hormone arrives at its target organ or tissue it causes certain actions to take place. Hormones may be grouped according to the functions they control.