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.
Headaches are a pretty common ailment and there is a lot of strong evidence that they go hand in hand with allergies. I know for me â someone who is prone to headaches, but not allergies â even has a connection. If I have a headache in the works and eat certain foods (like peanut butter) the headache gets worse.