Allergies are common. Heredity and environmental exposures may contribute to a predisposition to allergies. It is roughly estimated that one in three people have an active allergy at any given time and at least three in four people develop an allergic reaction at least once in their lives. In Western countries between 10–25% of people annually are affected by allergic rhinitis.
he characteristic symptoms of allergic rhinitis are: running nose, itching and nasal congestion and obstruction. Characteristic physical findings include conjunctival swelling and redness of eyelid swelling, lower eyelid venous stasis (rings under the eyes known as "allergic shiners "), swollen nasal cavities and middle ear effusion
There can also be behavioural signs; in order to relieve the irritation or flow of mucus, patients may wipe or rub their nose with the palm of their hand in an upward motion: an action known as the "nasal salute"
These condition in some cases co-exists with skin conditions like eczema, asthma and depression. Many homoeopathic remedies acute and constitutional are used some of them are Sabadilla, Sambucus-Nig, Sang-Can, Ars-Iod, Puls, Merc-sol, Nat-Sulph etc.