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Allergies
Allergy symptoms can range from mild to severe, even life-threatening. Find out what treatments and prevention tips can help.
Allergy medications: Know your options
Learn more about allergy medicines. Find out what they do and how they can help your symptoms.
Allergy shots
Allergy shots offer long-term relief from allergy symptoms. The treatments take 3 to 5 years to complete.
Alpha-gal syndrome
An allergic reaction to meat-based meals had researchers stumped — until they connected the condition to bites from certain ticks.
Anaphylaxis: First aid
How to administer first aid for anaphylaxis.
Bee sting
Learn about symptoms, treatment, self-care tips and prevention of bee stings, which in some people cause severe allergic reaction.
Cardiogenic shock
Most often the result of a severe heart attack, this rare condition can be deadly if not treated immediately.
Chronic daily headaches
If you have a headache most days, you might have one of the most disabling headache conditions, chronic daily headaches. Aggressive treatment and long-term management might help.
Cold urticaria
Learn more about the symptoms and treatment of this allergic skin reaction caused by cold that most often affects young adults.
Cyclic vomiting syndrome
Cyclic vomiting syndrome often starts in childhood and is marked by spells of vomiting several times an hour over a period of hours or days.
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