An allergy is an immune system response to a foreign substance that's not typically harmful to your body. These foreign substances are called allergens. They can include certain foods, pollen, or pet dander. Your immune system's job is to keep you healthy by fighting harmful pathogens.

Main allergy symptoms :

sneezing and an itchy, runny or blocked nose (allergic rhinitis) itchy red, watering eyes (conjunctivitis)

wheezing ,chest tightness, shortness of breath and a cough

a raised, itchy, red rash (hives)

swollen lips, tongue, eyes or face

tummy pain, feeling sick, vomiting or diarrhoea.

Most minor allergy symptoms can be treated with antihistamines, corticosteroids, or decongestants. Saline nasal rinses can be used for congestion-related allergy symptoms. Corticosteroid creams can treat skin rashes related to allergies. Immunotherapy is a long-term treatment option for chronic allergy symptoms.

Hayfever, also called allergic rhinitis, causes cold-like signs and symptoms, such as a runny nose, itchy eyes, congestion, sneezing and sinus pressure. But unlike a cold, hay fever isn't caused by a virus