What Is Alpha-Gal Syndrome? A Guide to This Tick-Related Allergy

In the Ozarks, warm weather often means time outside spent hiking, fishing, hunting or simply enjoying nature. But spending time outdoors also increases the risk of tick bites. One growing health concern linked to tick bites is alpha‑gal syndrome.

Alpha‑gal syndrome (AGS) is a food allergy connected to certain tick bites and is becoming more common across the United States. The condition can be confusing, especially because symptoms don’t appear right away. Understanding how it works is the first step to staying safe.

According to Dr. Charity Owusu-Asare, an allergy immunologist at CoxHealth, knowing what makes alpha‑gal different from other food allergies can help people recognize symptoms earlier and seek care sooner.

What is Alpha‑Gal Syndrome?

Alpha‑gal syndrome is an allergic reaction to alpha‑gal, a sugar molecule found in the saliva of certain ticks. This is especially true of the Lone Star tick, which is common in Missouri and other parts of the Midwest and South.

“When a tick bites, alpha‑gal from the saliva enters the bloodstream,” says Dr. Owusu-Asare. “Some people become sensitized to it, and others go on to develop a true allergy.”

Not everyone who is exposed will develop alpha‑gal syndrome. The condition is diagnosed when someone develops allergic symptoms after eating foods that contain alpha‑gal.

Foods and products that may contain alpha‑gal include:

• Beef, pork, venison and other game meats
• Some dairy products
• Foods cooked in beef or pork fat
• Certain medications and medical products

Why Alpha‑Gal is Different From Other Food Allergies

Most food allergies cause symptoms within minutes. Alpha‑gal does not.

“Alpha‑gal causes delayed reactions,” says Dr. Owusu-Asare. “Symptoms may appear several hours after eating red meat, sometimes up to eight hours later.”

Because of the delay, many people don’t realize their symptoms are related to food.

“They might eat dinner and wake up in the middle of the night with symptoms,” she says. “They wouldn’t immediately connect it to what they ate.”

Symptoms to Watch For

Alpha‑gal symptoms can range from mild to life‑threatening. Common symptoms include:

Skin and swelling

• Hives or itching
• Swelling of the lips, tongue or face

Gastrointestinal

• Heartburn
• Nausea or vomiting
• Abdominal pain
• Diarrhea

Respiratory

• Coughing
• Wheezing
• Shortness of breath

In severe cases, alpha‑gal syndrome can lead to anaphylaxis, a medical emergency that requires immediate treatment.

Some people have only gastrointestinal symptoms, which can easily be mistaken for indigestion or food intolerance.

“When these symptoms happen a few hours after eating foods containing alpha‑gal, they should be evaluated,” says Dr. Owusu-Asare.

When to Seek Medical Care

Anyone who develops symptoms after eating foods that may contain alpha‑gal should seek medical care.

Diagnosis typically includes:

• A detailed medical and dietary history
• Blood testing to measure alpha‑gal antibodies
• Eliminating alpha‑gal foods to see if symptoms improve

Treatment and Management

There is no cure for alpha‑gal syndrome, but it can be safely managed.

Treatment may include:

• Avoiding foods and products that contain alpha‑gal
• Taking antihistamines such as cetirizine or loratadine
• Carrying an epinephrine auto‑injector (EpiPen) for severe reactions

Certain factors can make reactions happen faster or more severely, including:

• Exercising after eating
• Drinking alcohol
• Taking nonsteroidal anti‑inflammatory medications, such as ibuprofen

Over time, alpha‑gal levels in the blood may decrease, especially if additional tick bites are avoided. In some cases, foods may be carefully reintroduced under medical supervision.

Protecting Yourself from Tick Bites

The best way to prevent alpha‑gal syndrome is to prevent tick bites.

To reduce your risk:

• Wear long sleeves and long pants outdoors
• Use EPA‑approved insect repellents
• Check your skin after outdoor activities
• Remove ticks promptly with tweezers
• Shower after being outdoors
• Wash and treat clothing to kill lingering ticks

“There’s no visible mark that tells you alpha‑gal is present,” says Dr. Owusu-Asare. “Avoiding tick bites is the best prevention.”

Key Takeaways: Alpha-Gal Syndrome and Tick Safety

• Alpha‑gal syndrome is a tick‑related food allergy that is becoming more common
• Symptoms are delayed and may appear hours after eating
• Reactions range from mild digestive symptoms to life‑threatening anaphylaxis
• Preventing tick bites is key
• Anyone with symptoms should seek care from a primary care provider or allergist

“Awareness has increased, and so has testing,” says Dr. Owusu Asare. “Knowing what to look for can make a big difference.”