Allergy eye drops

In time, the immune system learns to recognize and remember the allergen. As it does so, it starts making antibodies to attack it when exposure occurs. This buildup is called sensitizationTrusted Source.

Some allergies are seasonal. For example, hay fever symptoms can peak between April and May, when the tree and grass pollen count in the air is higher. A person may experience a more severe reaction as the pollen count rises.

Is it an allergy or an intolerance? Learn about the differences here.

Symptoms
An allergic reaction causes inflammation and irritation. However, the specific symptoms will depend on the type of allergen. For example, allergic reactions may occur in the gut, skin, sinuses, airways, eyes, or nasal passages.

Below are some triggers and the symptoms they may cause in people with an allergy.

Dust order cymbalta and pollen
a blocked or congested nose
itchy eyes and nose
a runny nose
swollen and watery eyes
a cough
Food
vomiting
a swollen tongue
tingling in the mouth
swelling of the lips, face, and throat
stomach cramps
shortness of breath
rectal bleeding, mainly in children
itchiness in the mouth
diarrhea
Insect stings
wheezing
significant swelling at the site of the sting
a sudden drop in blood pressure
itchy skin
shortness of breath
restlessness
hives, or a red and very itchy rash that spreads across the body
dizziness
a cough
chest tightness
Medication
wheezing
swelling of the tongue, lips, and cost of abilify face
a rash
itchiness
If symptoms become severe, anaphylaxis can develop.

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Anaphylaxis symptoms
Anaphylaxis is the severest form of allergic reaction. It is a medical emergency and can be life threatening. Anaphylaxis can develop quickly, with symptoms appearing within minutes or hours of exposure to the allergen.

Research suggests that anaphylaxis most commonly affects the skin and respiratory system.

Some symptoms include:

hives, flushing, and itchiness
difficulty breathing
wheezing
swelling
low blood pressure
changes in heart rate
dizziness and fainting
loss of consciousness
Recognizing these symptoms can be crucial to receiving timely treatment.

Learn more about the symptoms of anaphylactic shock here.

Causes
When an allergic reaction occurs, allergens bind to antibodies that the body produces called immunoglobin E (IgE). Antibodies combat foreign and potentially harmful substances in the body.

Once the allergen binds to IgE, specific types of cells — including mast cells — will release chemicals that trigger the symptoms of the allergic reaction.

Histamine is one of these chemicals. It causes the muscles in the airways and walls of the blood vessels to tighten. It also instructs the lining of the nose to produce more mucus.

Risk factors
People may have a higher risk of allergies if they are under 18 years old or have a personal or family history of asthma or allergies.

Some researchersTrusted Source have suggested that those born by cesarean delivery may also have a higher risk of allergies, as they do not have exposure to the mother’s microbiome during childbirth.

Common allergens
Potential allergens can appear almost anywhere.

In theory, a person can have an allergy to any food. Specific components — such as gluten, the protein present in wheat — can also trigger reactions.

The eight foods most likelyTrusted Source to cause allergies are:

eggs, especially the whites
fish
milk
peanuts
tree nuts
crustacean shellfish
wheat
soy
Learn more about food allergies here.

Some other common allergens include:

pet fur, dander, skin flakes, or saliva
mold and mildew
medications, such as penicillin
insect stings and bites
cockroaches, caddisflies, midges, and moths
plant pollens
household chemicals
metals, such as nickel, cobalt, chromium, and zinc
latex