allergy risks and benefits for patients

Overview

An allergy is when your immune system reacts to a normally harmless substance, like pollen, dust, pet dander, or certain foods. It treats the substance as a threat and releases chemicals to fight it off, which causes symptoms. Understanding your allergies can help you avoid risks and enjoy the benefits of better symptom control.

Yes, allergies are very common. Many millions of people around the world have at least one allergy, such as hay fever, food allergy, eczema, or asthma triggered by allergies.

Allergies can start at any age, but they often begin in childhood. Some allergies fade over time, while others last a lifetime. People with a family history of allergies, asthma, or eczema are more likely to develop them.

Symptoms

Common symptoms

• Sneezing, a runny or blocked nose
• Itchy, red, or watery eyes
• Itchy skin, hives, or a rash
• Coughing, wheezing, or a tight feeling in the chest
• Swelling of the lips, face, or eyes

Symptoms in children

• Eczema (dry, itchy patches of skin)
• Stomach pain, vomiting, or diarrhea after eating certain foods
• Frequent sneezing and rubbing the nose or eyes
• Trouble sleeping because of stuffy nose or coughing

Symptoms in older adults

• New or worsening allergy symptoms later in life
• Reactions to medicines that previously caused no problems
• Symptoms confused with other conditions like colds or sinus problems
• Dry or itchy eyes that last longer than usual

Causes

Main causes

• The immune system overreacts to a harmless substance (allergen)
• Common allergens include pollen, house dust mites, pet dander, mould, insect stings, and certain foods
• Sometimes allergens like latex or certain medicines can cause reactions

Risk factors

• A family history of allergies, asthma, or eczema
• Having asthma or eczema yourself
• Being a child or young adult, though allergies can appear at any age

When to see a doctor

See a doctor urgently if:

• If you have sudden or severe symptoms, especially trouble breathing or swelling, call your local emergency number immediately.
• Seek same-day medical advice if you have a reaction to a new medication or food, or if your symptoms feel worse than usual.

Book a routine appointment if:

• If allergy symptoms last for weeks or months and affect your daily life
• If you suspect a food allergy after a reaction
• If your usual allergy treatments are not working well

Diagnosis

Your doctor will ask about your symptoms, when they happen, and your family history. They may also examine your skin or nose. If they suspect an allergy, they can refer you for allergy testing.

Tests that may be done

• Skin prick test — a tiny drop of allergen is placed on your skin to see if it reacts
• Blood test (specific IgE) — checks for allergy antibodies in your blood
• Elimination diet — for suspected food allergies, you remove certain foods and add them back under medical supervision

What to expect at your appointment

Allergy testing is usually quick and safe. A specialist will explain what the results mean and work with you to create a personal action plan. You may need more than one test to confirm the diagnosis.

Treatment

There is usually no cure for allergies, but treatment can control symptoms and help you avoid severe reactions. The main approaches are avoiding triggers, taking medication, and in some cases building tolerance through immunotherapy.

Self-care at home

• Identify and avoid your allergy triggers as much as possible
• Use salt water nasal rinses for nasal allergy relief
• Keep windows closed on high pollen days and shower after being outdoors
• Wash bedding in hot water to reduce dust mites
• Carry any prescribed emergency medicine with you

Medical treatments

Several types of non-prescription and prescription medications can help, including antihistamines, nasal corticosteroid sprays, eye drops, and decongestants. Your doctor or pharmacist can advise which is right for you. For severe or persistent allergies, allergen immunotherapy (sometimes called allergy shots or drops) can gradually reduce your sensitivity to specific allergens.

When is surgery considered?

Surgery is not a usual treatment for allergies. It is rarely considered only when allergies cause constant sinus issues that do not improve with medication.

Living with this condition

Managing allergies is about planning and routine. Know your triggers, keep your home as allergen-free as possible, and make sure you always have your action plan and any needed medicines ready.

Lifestyle tips

• Keep a symptom diary to notice patterns and avoid triggers
• Use allergen-proof covers for pillows and mattresses
• Wash hands and change clothes after handling animals
• Check daily pollen counts or air quality when relevant

Diet and exercise

Eat a balanced diet and stay active, as good overall health supports your immune system. If you have food allergies, strict avoidance is essential. A dietitian can help you make sure you still get the nutrients you need.

Mental health and emotional wellbeing

Living with allergies can feel stressful, especially if you worry about severe reactions. It is normal to feel anxious or frustrated. Talk to your healthcare provider about any emotional difficulties — you deserve support too.

Prevention

You cannot always prevent allergies from developing, but you can reduce your risk of having symptoms or severe reactions by avoiding your known triggers and following your management plan.

Vaccines

There are no standard vaccines to prevent allergies, but allergen immunotherapy is sometimes described as a 'vaccine-like' treatment because it builds long-term tolerance to specific allergens. Ask your allergist if this might be suitable for you.

Screening programmes

Routine screening for allergies is not recommended for everyone. Your doctor may suggest allergy tests if you have symptoms that point to a specific allergen.

Complications

If left untreated

• Asthma attacks or worsening asthma control
• Chronic sinusitis or nasal polyps
• Sleep problems and daytime tiredness
• In rare cases, severe anaphylaxis, which is a medical emergency

Long-term outlook

With the right diagnosis and care, the outlook is very positive. Most people with allergies can control their symptoms well and continue to enjoy everyday life. Newer treatments and strategies are better than ever at helping people feel safe and healthy.

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