Alpha-gal Syndrome (AGS) - Educational overview
Unexplained reactions after meals?
Alpha-gal syndrome is one specific, tick-linked food allergy pattern that can cause stomach flares, hives, or night-time reactions that seem random. Some people arrive here with vague inflammation or food issues and have never heard of Alpha-gal; others already live with allergies and just learned about it. Some notice symptoms within 2030 minutes, while others only notice a delayed wave 26 hours after eating, often after tick exposure in the Southeast and Appalachian regions.
Common patterns people describe
- Stomach pain, nausea, or diarrhea after meals that include red meat.
- Hives or itching that show up at night, a few hours after eating.
- "Random" reactions that line up with beef, pork, lamb, or high-fat mammal foods.
- Symptoms that began after one or more tick bites, even if you did not see every tick.
Alpha-gal at a glance
Certain ticks in the Southeast and Appalachian regions can trigger IgE antibodies to Alpha-gal. Many people never notice or remember the bite that started it.
Alpha-gal is found in most mammalian meat (beef, pork, lamb) and some high-fat mammal products.
Some people have early stomach symptoms within 20-30 minutes. Many have a delayed wave 2-6 hours later, and some notice symptoms that come and go for 1-2 days.
Typical Alpha-gal symptom timing
Early stomach phase
Some people notice early stomach discomfort, nausea, or cramps within 20-30 minutes after eating.
Delayed reaction window
Many Alpha-gal reactions peak several hours after a meal, often with hives, stomach pain, or night-time symptoms.
Waxing and waning
In some people, symptoms come and go over 1-2 days as Alpha-gal is absorbed more slowly from the gut.
Not everyone has all of these phases. This timeline is for education only and does not replace medical advice or emergency care.
Still unsure if Alpha-gal fits your story?
Use our educational symptom checklist to look for patterns to discuss with your clinician. It is not a diagnosis or a substitute for emergency care.