Experts warn the public to be cautious of allergens, substances that can cause allergic reaction to the body, as allergies can sometimes be life-threatening.

Allergy causes can vary from person-to-person. According to experts, common allergens are food, molds, insect bites, pollen, and drugs.

Allergies are 'abnormal' responses of the body triggered by the immune system. Normally, the immune system fends off foreign substances known as antigens. As a combat mechanism, the body produces antibodies and other chemicals. However, during an allergic reaction, the body inappropriately reacts, releasing chemicals such as histamine to attack protein. When this occurs, common symptoms of allergies occur.

Allergic symptoms include rashes, asthma, reddening of the eyes, among others.

According to experts, most allergies are not serious and can be treated with various over the counter or prescription drugs. However, there can be times when allergies can result to severe illness, demanding immediate medical attention. If not immediately treated, it can result to death.

Anaphylaxis is the life-threatening allergic reaction which causes a sudden release of chemicals by the body's immune system. When this occurs, chemicals cause the body to undergo shock, causing a sudden drop in the blood pressure and difficulty breathing.

When undergoing anaphylaxis, experts said a patient must be immediately rushed to the hospital emergency room and be injected by epinephrine.

This holiday season, experts warn the public to be extra cautious of food allergens as some may be present in dishes served during gatherings.

According to infectious disease expert Dr. Rey Salinel, some allergens can be 'hidden' in cooked dishes.

"Minsan nga hindi mo mamamalayan,pero nag-manifest sayo [ang] allergy. Ibig sabihin nakakakuha ka (Sometimes you won’t notice the food allergen until the allergic reaction manifests in your body)," he said.

Common food allergens include seafood, peanuts, and eggs