In the moment when antibodies come in the contact with mast cells, they are changing structure of membranes and with that they make various chemicals. The main player in inflammation of surrounding tissues is chemicals known as histamine. Various are food allergy symptoms. They may be ranged from mildly inconvenient and up to total collapse of the body, followed in the worst cases with the death, but there are also and symptoms of food allergy which are known as anaphylaxis. With using allergy relief medicine antihistamines you will be relief of symptoms such as watery eyes, rash, runny nose, sneezing and itching eyes. But, when it is about decongestants, you will feel relief from congestion, in breathing and promote sinus. Also, it is important to mention that decongestants and antihistamines may have side effects. According to the some studies, the allergies are most caused with the genetic code or hereditary. But, also there are and other side, that says that allergies are something which is developing during the time and also disappear during the time. The fact is that there are several factors which are influence on triggering of the body to respond on allergy symptoms. Skin allergy not only that may be caused with the creams, body lotions, or other cosmetic products, but also it could be caused with the usage of the certain food, such as: beef, horse meat, eggs, pork, chicken, fish, soy, corn, dairy products, etc. In direct contact with the skin, the most usual is contact dermatitis. The most cause of inflammation of your sinuses, with duration from few days and more than three months is bacteria infection. In the case that your sinusitis is type with longer duration, then it could be said that you have a chronic sinusitis. The most reason that causes of chronic sinusitis is attack which is flu, coldness or allergy attack. Hypersensitized State And How Does Your Immune System Comes Into It There are more doctrines about how immune system goes into a hypersensitized state. The most logical explanation is that allergies are connected with genetic codes and that they always caused by protein. So, white blood cells usually are not able to make differences between proteins which are threatening and those which are non-threatening.