Allergies are a common and often misunderstood health condition that affects millions of people worldwide. An allergy is a hypersensitivity of, or over-reaction by the immune to, a foreign substance, termed as an allergen and often non-infectious, that comes in contact with the body.

• Food :This type of allergy develops when the immune system reacts to particular proteins found in certain foods. Common allergens include peanuts, tree nuts, eggs, milk, soy, wheat, fish, and shellfish.
• Seasonal allergies: Also referred to as hay fever or allergic rhinitis, are triggered by an immune reaction to grass and tree pollen. Typical allergies include fish, shellfish, eggs, milk, soy, tree nuts, peanuts, and tree nut products.
• Drug allergies: This type of allergy occurs when the immune system responds negatively to certain medications. Common allergenic drugs include sulfa drugs, antibiotics such as penicillin, and aspirin.
• Insect sting allergies: This type of allergy occurs when the immune system reacts to insect venoms, such as those from wasps, bees, ants, and hornets.
• Latex allergies: This type of allergy occurs when the immune system reacts to latex, a material used in manufacturing rubber gloves, balloons, and other items.

The causes of allergies are multifactorial, including genetic, environmental factors, and immune system dysfunction.

• Genetics
• Immunity
• Environmental factors
• Air pollution
• Climate change
• Chemicals
• Lifestyle factors

• Nasal symptoms: Common symptoms include sneezing, congestion, runny nose, and eye and nose itching.
• Skin Symptoms: Eczema is a chronic skin disease characterized by dry, itchy skin that can swell and produce red, scaly patches.
• Respiratory Problems: Respiratory symptoms such as coughing, wheezing, and shortness of breath can occur.
• Digestive problems: Allergies may also lead to digestive symptoms like nausea, vomiting, and diarrhea.