The Most Common Types of Allergies Explained

woman sitting on sofa and blowing her nose into a tissue

She thought it was just pollen or dust

Sneezing didn’t worry her.
It came with the weather.
Then came the itch.
Then headaches.
Then no sleep.
What started as mild became constant.
It wasn’t just one cause.
It was layers.
And no one told her they were all called “allergy.”

Allergic rhinitis doesn’t stop with a stuffy nose

Every morning, he woke up with pressure.
Some days it felt like a cold.
But it never left.
His eyes watered.
His throat was always sore.
Pollen was one trigger.
Dust was another.
The air inside mattered more than the air outside.
He learned to stop blaming the season.

Food allergies don’t always look like swelling or rashes

Her reactions came hours later.
Sometimes the next morning.
Bloating.
Foggy brain.
Mood dips.
No one saw it as an allergy.
But the allergist did.
Eggs were the cause.
Removing them gave her back her focus.

Intolerance and allergy are not the same

He always blamed gluten.
Cut it out.
Still felt tired.
The allergist said, “This isn’t an allergy.”
It was intolerance.
His immune system wasn’t reacting.
His digestion was.
It made a difference in what came next.

Contact allergies can come from everyday things

She used a new moisturizer.
Within hours, her face turned red.
Dry.
Painful.
She stopped it.
But the reaction stayed.
The patch test showed it was fragrance.
Something in almost every product she owned.

Insect allergies don’t always give you warning

He was stung before.
A little swelling.
Nothing serious.
Then the next sting came with hives.
And the third with shortness of breath.
An EpiPen became part of his routine.
He didn’t want it.
But he wanted to keep breathing.

Drug allergies don’t always come with the first dose

She’d taken that antibiotic before.
No issues.
But the second time, her lips tingled.
Her heart raced.
A rash crept up her arms.
It was an allergy.
One that didn’t exist before.
But it did now.
And it could return stronger.

Pet allergies aren’t always about the fur

He adopted a cat.
Two weeks in, he couldn’t sleep.
Not sneezing.
Just blocked breathing.
The dander caused inflammation.
The air changed.
His body responded.
He didn’t want to let go of the cat.
But he had to make choices.

Mold allergies live in quiet corners

She coughed only at night.
Only in the basement.
The walls looked clean.
But the allergy test showed mold.
Behind the drywall.
In the vents.
She moved her bedroom.
The cough stopped in three days.

Some allergies are triggered by cold, heat, or sunlight

He got hives after swimming.
The water wasn’t dirty.
It was just cold.
Cold urticaria.
Not common.
But real.
Some people react to sun.
Others to heat.
The body reads temperature like a threat.

Multiple symptoms don’t always mean multiple causes

She had migraines.
Stomach pain.
Dry patches on her elbows.
No one connected them.
Until the allergist tested for soy.
It was one source.
Three symptoms.
That’s why allergy diagnosis needs pattern recognition.

Moving to a new city triggered a new set of allergies

He never reacted to trees before.
But in a new place, he couldn’t breathe.
Different pollen.
Different plants.
Your immune system learns new enemies in new places.
It adapts.
Sometimes too much.

Children develop allergies differently than adults

Her toddler had skin reactions.
But no known food allergy.
The allergist said babies react through skin first.
Digestion comes later.
Knowing that helped her make better choices.

Some allergies fade—and some return

He outgrew his peanut allergy.
Then it returned in his twenties.
Stronger.
More dangerous.
Allergies aren’t permanent.
They’re not predictable either.
That’s why re-checking matters.

Fragrance, nickel, latex—they’re common but often ignored

She wore a new necklace.
Her neck burned.
Nickel allergy.
The watch gave her a rash.
Latex in the band.
The perfume she loved gave her a headache.
Fragrance sensitivity.
All common.
All overlooked.