Not to be confused with hemostasis. Homeostasis or homoeostasis (homeo- + -stasis) is the property of a system in which variables are regulated so that internal conditions remain stable and relatively constant. Examples of homeostasis include the regulation of temperature and the balance between acidity and alkalinity (pH). It is a process that maintains the stability of the human body's internal environment in response to changes in external conditions.
Allergies, also known as allergic diseases, are a number of conditions caused by hypersensitivity of the immune system to something in the environment that usually causes little problem in most people.
Allergies, by definition, are a reaction to the body seeing something as foreign.. Based on this, any part of your body that comes into direct contact with the environment around us or the things we breathe or ingest can cause an allergic reaction.llergies also can frequently cause headaches, fatigue and irritability. When you eat a food it does get distributed throughout the body in an allergenic form and can cause allergic reactions in different parts of the body.