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Kate Middleton's severe allergy – did you spot it?

The Duchess of Cambridge showed signs of her allergy

The Duchess of Cambridge always looks picture-perfect, but photos of the royal out and about on Tuesday showed that she suffers from allergies.

MORE: From Princess Charlotte to Kate Middleton - all the times royals suffered from hay fever

During a visit on Tuesday, Prince William's wife looked visibly red around the eyes, hinting at her hay fever woes – and it's not the first time that pollen allergy has given Duchess Catherine issues.

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The mum-of-three has been pictured a number of times sneezing during the spring and summer months - including during a ride in the carriage during Royal Ascot, on the Buckingham Palace balcony and at Chelsea Flower Show.

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Tuesday was the first time the Duchess has appeared to suffer from eye issues as a result of pollen, though. So why does pollen wreak havoc on our eyes?

"Pollen sets off a cascade of inflammatory reactions and this triggers your body to go into self-defence mode," says Alex Ionides ophthalmic surgeon at Moorfields Eye Hospital, who co-founded eyecare brand MTHK.

Duchess Kate's eyes looked red and sore on Tuesday

"When the cells in your eyelids release histamine, the blood vessels leak fluid, protein and other inflammatory cells that result in redness, itching, and watery eyes to name a few," Alex continues.

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There are a few clever ways to ease itchy, red eyes that have been affected by hay fever.

MTHK's Eye Spray for Dry Eyes gives the surface of the eyes a hit of much-needed moisture to alleviate stinging for up to eight hours – plus, it doubles up as an eye wash to clear pollutants and allergens from the eyes.

MTHK Eye Spray for Dry Eyes, £14.99/$18.02, Amazon

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Peep Club's Heated Eye Wand is ideal for alleviating dry eyes too. The magic wand was created with an optometrist to help dry eyes produce tears that hydrate the eyes, moisturising them and ridding pollen from the area.

Peep Club Eye Wanted Heated LED Massager, £60/$96, Wolf & Badger

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Lumity Ice Globes are ideal if you get puffy eyes during hay fever season. Hold the frozen orbs against your eyes to take down redness and soothe irritation.

Lumity Skin Routines Ice Globe Roller, £35, John Lewis

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