While speaking about the signs and symptoms you should understand the difference between these two notions. The sign is the thing that a particular patient has what causes suspicion to a disease. The symptoms are the scientifically described phenomena which are typical to disease.
There is not a universal description of the allergy symptoms. They can be different depending on the peculiarities of the patient. Never try to treat allergies basing on your own judgment, consult with your doctor. Only in this case you will be sure whether you have the disease or not. Mistreatment won’t do well it will only harm your health.
Possible Allergy Symptoms
The possible symptoms you can find in any medical book
 General symptoms possible from allergies:
Allergic dermatitis
Itchy rash
Eczema
Hay fever
Asthma
Anaphylactic shock
Skin reactions
Skin swelling
Swelling around the eyes
Wheezing
Breathing difficulties
Headaches
Abdominal pain
Diarrhea
Symptoms of airborne allergies:
Sneezing
Runny nose
Blocked nose
Coughing
Postnasal drip
Itching eyes
Itching nose
Itching throat
Dark circles under the eyes (Allergic shiners)
Nose rubbing
Allergic salute (persistent upward nose rubbing)
Watering eyes
Conjunctivitis
Red-rimmed eyes
Swollen eyes
Crusting of eyelids
Allergic dermatitis - a skin rash
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