OSHA universe, the Exclamation Mark signifies an immediate skin, eye or respiratory tract irritant, or narcotic.<unk> , in biology and physiology, is a state of inflammation or painful reaction to allergy or cell-lining damage. A stimulus or agent which induces the state of<unk>  is an irritant. Irritants are typically thought of as chemical agents (for example phenol and capsaicin) but mechanical, thermal (heat), and radiative stimuli (for example ultraviolet light or ionising radiations) can also be irritants.<unk>  also has non-clinical usages referring to bothersome physical or psychological pain or discomfort.<unk>  can also be induced by some allergic response due to exposure of some allergens for example contact dermatitis,<unk>  of mucosal membranes and pruritus. Mucosal membrane is the most common site of<unk>  because it contains secretory glands that release mucous which attracts the allergens due to its sticky nature. Chronic<unk>  is a medical term signifying that afflictive health conditions have been present for a while. There are many disorders that can cause chronic<unk> , the majority involve the skin, vagina, eyes and lungs.
Irritation
Tickling
Overeating
Hyperesthesia
Food craving
Retching
Sniffing 
Heat intolerance