Are Allergy Genes Hereditary? Understanding Your Risk

For many, allergies are a bothersome part of life, causing everything from sneezing fits to skin rashes. But have you ever wondered why some people seem more prone to them than others? The answer often lies in our genetics. It’s a common question we receive at PillSorted: are allergy genes hereditary? In this post, our Superintendent Pharmacist Zeinab Ardeshir explains the genetic link to allergies and outlines the various ways we can identify and manage them.

Are Allergy Genes Hereditary? Understanding Family Links

There’s substantial evidence pointing to a significant genetic factor in allergies. If one parent has an allergy – be it hay fever, eczema, a food allergy, or asthma – there’s approximately a 50% chance their child will develop some form of allergy. This doesn’t necessarily mean the child will have the exact same allergy as the parent; for example, a parent with eczema might have a child with hay fever or a food allergy. When both parents have allergic reactions, the likelihood increases significantly, up to a 70% chance that their child will develop an allergy. So, yes, hereditary factors play a crucial role.

This means children inherit an immune system that is inherently more sensitive. This heightened sensitivity can cause the body to react to substances that are generally harmless, such as pollen, dust mites, or certain foods. Understanding this genetic predisposition is the first step towards effective management and prevention.

Identifying Allergens: The Role of Testing

Given that genetic factors can make you susceptible to various allergens, it’s vital to get tested to pinpoint exactly what triggers your reactions. Many people experience symptoms without knowing the specific cause. As a pharmacist, when I hear about certain recurring symptoms, I often recommend getting an allergy test.

Common symptoms that might suggest an allergy include:

• Seasonal issues: Runny nose, swollen eyes, and itchy ears (typical of hay fever).
• Digestive problems: Upset stomach after consuming certain foods.
• Skin reactions: Rashes or persistent itching without an obvious cause.

When you consult with a healthcare professional, they’ll typically inquire about your family history of allergies, which helps in understanding the potential role of hereditary allergy gene patterns. There are several types of tests available:

• Skin Prick Test: This involves applying tiny amounts of common allergens (like dust mites, grass or tree pollen, or pet fur) to your forearm and then pricking the skin. If swelling appears after about 15 minutes, it indicates an allergy to that specific trigger.
• Specific IgE Blood Tests: For more severe cases, such as severe eczema, these tests look for specific immunoglobulin E antibodies in your blood, which are produced in response to allergens.
• Patch Testing: Used for contact allergies, where skin reacts to direct contact with substances like certain metals (e.g., nickel). Small patches containing potential allergens are applied to the skin for a period to observe reactions.

Managing Your Allergies: Avoidance and Lifestyle Adjustments

The first and arguably most crucial step in treating any allergy, especially when hereditary allergy genes are at play, is avoidance. By identifying your specific triggers through testing, you can take targeted measures to minimise exposure. Here are some common avoidance strategies:

• Dust Mites: Invest in anti-allergy mattresses and pillows. Regularly hoover your home, especially carpets and soft furnishings, and wash bedding at temperatures over 60 degrees Celsius to kill dust mites.
• Pet Allergies: Use HEPA filters in your home to capture pet dander. Try to keep pets out of your bedroom, and hoover regularly to remove allergens.
• Pollen: Keep an eye on daily pollen counts. During high pollen periods, keep doors and windows closed, particularly in the evenings when pollen levels can be highest. Mop surfaces frequently to remove settled pollen, and take a shower after coming home to wash off any pollen from your body and hair.
• Food Allergies: If you have a known food allergy, it’s essential to keep a detailed note of what you can and cannot eat. Always check food labels carefully for allergens.

Beyond specific allergen avoidance, maintaining a healthy lifestyle can also support your immune system and overall wellbeing, potentially reducing the severity of allergic reactions. For more general advice on staying healthy, visit our General Health section.

Effective Treatments: Medications

While avoidance is paramount, various medications can help manage allergic symptoms, particularly when your hereditary allergy gene predisposition means you can’t always avoid triggers.

Antihistamines

Antihistamines are often the first line of treatment. There are two main generations:

• Older Generation (e.g., Chlorpheniramine, like Piriton Children’s Allergy Syrup): These can cross the brain barrier, leading to drowsiness. They are short-acting, typically lasting around eight hours, so you might need to take them two to three times a day. They can be particularly useful if itching or swelling disrupts your sleep.
• Newer Generation (e.g., Cetirizine, Loratadine like Clarityn, and Fexofenadine like Treathay): These are non-drowsy as they don’t cross the brain barrier. They are longer-acting, often only requiring a single daily dose. If you find one type isn’t working as effectively after a couple of months, it’s not a bad idea to try switching to another in this generation, as individual responses can vary. Keeping a supply of these on hand is wise, especially if your hereditary allergy genes make you prone to frequent reactions.

Local Treatments

For localised symptoms, specific treatments can be very effective:

• Steroid Creams (e.g., Hydrocortisone acetate cream HC45): Excellent for relieving itchy skin and reducing swelling. However, they should not be used for prolonged periods. If you find yourself needing to use them too often, consult a healthcare professional.
• Antihistamine Creams (e.g., Anthisan Bite and Sting): These topical creams are good for relieving itching and swelling from insect bites or stings.
• Eyedrops (e.g., Sodium Cromoglicate, Azelastine): For watery, itchy eyes, sodium cromoglicate eyedrops work by stabilising mast cells, preventing them from releasing histamine. Local antihistamine eyedrops like azelastine also help reduce the effect of histamine. Both types are available at most pharmacies.
• Nasal Sprays:
  • Steroid Nasal Sprays (e.g., Clarinaze, Beconase): These reduce inflammation in the nasal passages, helping with congestion, sneezing, and runny nose. They take about two weeks to achieve their full effect, so it’s often recommended to start them before hay fever season begins.
  • Decongestant Nasal Sprays (e.g., Sudafed Blocked Nose Spray): These provide quick relief from congestion. However, they should not be used for more than three days consecutively, as prolonged use can cause “rebound congestion,” making symptoms worse.
  • Sinus Rinse (e.g., NeilMed Sinus Rinse): An isotonic saline solution, a sinus rinse is a highly effective, yet often underrated, way to clear nasal passages. It helps reduce mucus, coughing, and congestion around the ears, eyes, and nose, promoting better breathing and sleep.

Emergency Treatment

For severe allergic reactions, known as anaphylaxis, an adrenaline auto-injector (e.g., EpiPen) is a life-saving medication. It works rapidly to reverse the effects of histamine on smooth muscles, which can otherwise lead to choking and loss of consciousness. These injections are easy to administer, even through clothing. If you or a loved one has a severe allergy, it’s crucial to learn how to use an adrenaline auto-injector.

When to Seek Professional Advice

For mild allergies like hay fever, minor skin reactions, or insect bites, many effective over-the-counter treatments are available. However, if your symptoms are not controlled by these remedies, or if they persist for too long, it’s advisable to consult with your GP. They may recommend further blood tests or explore other treatment options.

Crucially, if you experience any signs of breathing difficulty, throat swelling, or collapse (falling to the ground), this is an emergency. Even if an adrenaline auto-injector is used, it is still vital to call emergency services immediately, as symptoms can sometimes return.

Understanding that hereditary allergy genes predispose some individuals to allergies is key to managing them effectively. With proper identification of triggers, avoidance strategies, and appropriate treatments, you can significantly improve your quality of life. For safe, clinician-led advice on managing your allergies or any other general health concerns, don’t hesitate to reach out to the team at PillSorted. We’re here to help you feel better.

Disclaimer: This blog post is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional before making changes to your health routine.