Symptoms Made Simple
Alpha-gal syndrome (AGS) is an allergy that can develop after certain tick bites. Unlike most food allergies, it usually causes a reaction 3 to 8 hours after eating, instead of within a few minutes.
People with AGS react to alpha-gal, a type of sugar found in most mammals (such as cows, pigs, deer, and lambs).
What Can Trigger a Reaction?
Many people with AGS react after eating or using products that contain alpha-gal, including:
Beef
Pork
Lamb
Venison (deer meat)
Organ meats
Some dairy products (milk, cheese, ice cream, etc.)
Foods containing gelatin
Some medicines and vaccines
Certain personal care products
Not everyone reacts to all of these. Each person's triggers can be different.
Common Signs of Alpha-gal Syndrome
Skin Symptoms
These are the most common symptoms.
Itchy skin
Hives (raised, itchy bumps)
Red or flushed skin
Swelling, especially of the hands, feet, lips, or face
Many people first notice intense itching on the palms of their hands or the soles of their feet.
Stomach and Digestive Symptoms
Some people only have stomach problems, making AGS difficult to recognize.
Common symptoms include:
Stomach pain
Cramping
Nausea
Vomiting
Diarrhea
Heartburn
About 60% of people with AGS have digestive symptoms, and up to 20% may have only digestive symptoms.
Breathing Problems
Some reactions affect the lungs or throat.
Symptoms may include:
Shortness of breath
Wheezing
Tight feeling in the chest
Coughing
Hoarse voice
Trouble breathing
These symptoms can become serious and result in full anaphylaxis and need immediate medical attention.
Heart and Blood Pressure Symptoms
Some people experience changes in their heart or blood pressure, including:
Dizziness
Feeling like you might faint
Fainting
Fast heartbeat
Low blood pressure
Shock (a medical emergency)
Other Possible Symptoms
Some people also report:
Joint pain
Long-lasting itching
Headaches or migraines (less common)
Uterine cramping during a reaction
These symptoms are less common than skin or stomach problems.
What Makes AGS Different from Other Food Allergies?
Alpha-gal syndrome is unusual because:
Symptoms usually start 3–8 hours after eating, often waking people up during the night.
Many people develop it as adults, even if they have eaten red meat for years without problems.
A tick bite usually happens before the allergy develops.
Symptoms can vary a lot from person to person and even from one reaction to the next.
Avoiding foods and products with alpha-gal often improves symptoms.
