Ticked Off! How Alpha-Gal Allergy Turns a Meal Into a Medical Crisis

For years, people worried that a tick bite might lead to Lyme disease, Rocky Mountain spotted fever or some other dangerous infection. Those concerns are certainly justified. But an entirely different threat has emerged over the last two decades, one that can turn a hamburger, a prescription medicine or even a hospital procedure into a medical emergency. Alpha-Gal Allergy is a strange and potentially life-threatening condition triggered by certain tick bites.

Although awareness has improved dramatically since scientists first described it in 2009, many patients still struggle to get diagnosed and some healthcare professionals remain unfamiliar with its dangers.

What is Alpha-Gal Allergy?

This unusual reaction was first described in the medical literature 17 years ago by a group of researchers at the University of Virginia (Journal of Allergy and Clinical Immunology, Feb. 2009). We were among the first medical journalists to interview Dr. Thomas Platts-Mills, the physician/researcher who helped discover this strange allergic reaction. He was head of the Division of Allergy and Clinical Immunology at the University of Virginia at that time. We talked with him on our People’s Pharmacy public radio show on October 1, 2011.

It took many years for emergency physicians and other health professionals to appreciate the significance of this allergy. That is partly because the trigger is complicated and unlike most other allergies.

First, there is the tick bite. Originally, lone star ticks (Amblyomma americanum) were the only suspects. Now, scientists have linked this problem to two other species as well, black-legged ticks (Ixodes scapularis) and western black-legged ticks (Ixodes pacificus).

Days to weeks later, the person enjoys a BLT or a burger for supper, goes to bed at the usual time and awakens in distress hours later. Symptoms range from horrible hives to vomiting and diarrhea or tongue swelling and wheezing.

The cause is a reaction to a sugar in mammalian meat, galactose-alpha-1,3-galactose. The condition is also called alpha-gal syndrome (AGS). Some people are so sensitive that if they breathe the smoke from a barbecue they can react badly.

The treatment is to avoid eating mammals–no beef, pork, lamb or other mammalian meat. Birds and fish do not carry this sugar, so people with alpha gal allergy can safely eat them.

Alpha-Gal Allergy Can Be Life Threatening!

We have heard from a lot of visitors to this website about their alpha-gal allergic reactions. They vary from mild to life threatening.

A life-threatening story:

“Six years ago, I headed to the ER with hives and intolerable itching. While waiting in triage I went into anaphylaxis. I was given IV Benadryl and epinephrine.

“The doctors had no idea what caused these symptoms. A nurse who happened by said it was perhaps a tick bite meat allergy.

“My primary doctor referred me to an allergist, who had never heard of alpha gal. He looked it up and got very excited to see his first possible case! He did not have the alpha gal blood test available.

“On my own, I researched alpha gal and began meat avoidance. My primary doctor prescribed an Epipen just in case. I have had reactions to flavorings, gelatin and other hidden ingredients.

“I worry about being hospitalized and unable to speak up for myself. After surgery two years ago with a 10-day hospital stay, the staff repeatedly delivered food I couldn’t eat despite alpha gal being on my records.”

That is a legitimate concern.

Here is what another reader told us:

“I recently needed an emergency appendectomy. No one at the hospital had ever heard of alpha gal–not the attending doctor, not the nurses, nor the surgeon. Fortunately, they listened to me and took it seriously.

“As I was rushed from the scan to pre-op, I was told to be certain that the anesthesiologist understood what this condition involved, because some of the drugs they use may have substances derived from beef! The anesthesiologist made them hold the surgery until he consulted his colleagues so that he could avoid bovine ingredients.”

Many other readers have described alpha-gal allergic reactions. This is a favorite:

“You may have saved my mother’s life many years ago by reporting on alpha gal allergy. Her mysterious symptoms had gradually increased over time to difficulty breathing when I learned of the tick-related allergy.”

Why Doctors Have Missed Diagnosis Alpha-Gal Allergy

Most allergic reactions happen quickly. Someone with a peanut allergy may develop symptoms within minutes. Bee sting reactions are often immediate.

Alpha-Gal Allergy is different.

A person may eat a steak at 7 p.m., go to bed feeling perfectly fine and awaken at 2 a.m. covered in hives, struggling to breathe or doubled over with abdominal pain.

Because symptoms appear so much later, neither patients nor healthcare professionals immediately connect the reaction to dinner.

As a result, Alpha-Gal Allergy can be mistaken for:

• Food poisoning
• Irritable bowel syndrome
• Acid reflux
• Panic attacks
• Unexplained hives
• Chronic gastrointestinal disorders
• Idiopathic anaphylaxis [life-threatening allergic reaction of unknown origin]

Alpha-Gal Allergy Is Spreading:

Q. My husband was recently diagnosed with alpha-gal allergy after an emergency room visit with a body full of hives and a swelling tongue. He has had reactions twice more after eating meat. When he finally saw an allergist, he was told to avoid meat and dairy.

Can you get medications in capsules without gelatin? He woke up this morning with hives, and we have no idea what caused them. We suspect his medicine.

He had surgery at a top hospital in July, and none of the physicians or nurses had heard of alpha-gal! In our part of New York, very little is known about this syndrome, but our allergist said he is seeing more and more of it.

A. Alpha gal reactions were first identified in Virgina, Tennessee and North Carolina, where they have been linked to bites from a lone star tick. Following the tick bite, some people develop alpha-gal allergy. This severe allergic reaction to a sugar in mammalian blood appears several hours after eating beef, pork or lamb. The reactions are to mammalian products only; fish and fowl are fine.

It sounds as if your husband is especially sensitive, as not all patients must avoid dairy products as well as meat. He may need to request non-gelatin capsules from a compounding pharmacy to avoid future reactions. Keep reading for more details on alpha-gal allergy.

Doctors Now Watching for Alpha-Gal:

People bitten by a lone star tick may develop a delayed allergic reaction to consuming meat from cows, pigs, sheep or other mammals. This alpha-gal syndrome can be severe and often requires emergency treatment. Several years ago, a lot of doctors were unfamiliar with this mysterious condition. As a result, it often took years for patients to be diagnosed correctly. A new study shows that the lag between the start of symptoms and the diagnosis of alpha-gal allergy has shortened dramatically (JAMA Network Open, March 10, 2025).

The researchers collected allergy clinic patient records from two different time frames: first, from 2009, when alpha-gal was first described in the medical literature, and then in 2024. The first group of patients struggled for more than 5 years, on average, before receiving a diagnosis. Those in the more recent group got a diagnosis within about a month. This is a huge improvement!

Unfortunately, not everyone gets a prompt diagnosis, even now. The data indicate disparity by educational attainment. Overall, people with a high-school diploma needed four years to convince healthcare providers they were really sick. Those with graduate degrees managed it in less than a year and a half.

Symptoms of Alpha-Gal Allergy:

• Skin reactions (rash, hives, itching especially on palms or soles)
• Digestive upset (nausea, diarrhea, heartburn, abdominal pain)
• Respiratory tract problems (runny nose, sneezing, breathing difficulties, wheezing)
• Headache
• Low blood pressure, anaphylaxis, collapse

Several readers recount their own experiences with alpha-gal allergy below.

Ground Beef Reaction Led to Emergency Treatment:

Q. Several years ago, I had a tick bite that resulted in a very pronounced rash. A week or so later, I had ground beef for supper and landed in the ER with anaphylaxis at 3 in the morning. They told me to consult an allergist, who was very familiar with alpha-gal syndrome. He immediately made a preliminary diagnosis that was confirmed by a blood test.

The interesting thing is that this allergic reaction can go into remission. I went for three years with a very strict no-red-meat diet. We tested my blood titer annually, and it fell each year. I still eat very little red meat on a weekly basis, but now I sometimes eat a hamburger without any symptoms.

To repeat, I was under the care of an allergist. I wouldn’t recommend anyone just winging it after a few years. That could result in disaster.

I have been extremely careful to avoid tick bites ever since. Fortunately, insect repellent that repels ticks keeps chiggers away too.

Staying Away from Meat Makes a Difference:

A. Thank you for sharing your experience with alpha-gal allergy. This potentially severe allergic reaction to eating mammalian meat (beef, lamb, pork, or even rabbit but not chicken or fish) is triggered by the bite of a lone star tick (Amblyomma americanum). People’s reactions to this problem vary widely. Not everyone gets over it as you apparently have.

It is prudent to avoid tick bites. Ticks can transmit a wide range of pathogens responsible for severe diseases.

Wear long pants tucked into your socks and, if possible, gaiters treated with permethrin. You are correct that this strategy repels chiggers as well as many varieties of ticks.

Removing clothing and doing a tick check as soon as you get into the house from walking in woods or fields is also essential. A shower is a good opportunity to check all the secret spots ticks love and also helps wash away chiggers.

How Long Do These Problems Last?

Q. Does alpha-gal allergy ever go away? Ten years ago, I was bitten by a lone star tick. Since then, I’ve had two anaphylactic reactions to eating meat. Will I ever be able to enjoy bacon again?

A. Alpha-gal allergy is a reaction to eating mammalian meat (beef, pork, lamb or goat, but not chicken or fish) triggered by a bite from the lone star tick. Reactions vary widely, from the life-threatening allergic reaction that you experienced to unpleasant stomach cramps and diarrhea. Certain people don’t have any trouble with dairy products like milk or cheese, while other are sensitive to these or even to the smoke rising from a barbecue grill.

The length of time people may suffer with their symptoms also differs from one to another, with some recovering within a few years and others needing to avoid mammalian products for an indefinite time.

Surprising Health Hazards for People with Alpha-Gal Allergy:

Q. I have tested positive for alpha gal syndrome. I recently developed elevated blood pressure and I have had an allergic reaction to every BP medication my doctor has prescribed. One drug gave me a red rash over my entire body.

The physician who diagnosed my alpha-gal allergy, Dr. Commins, suggested having a compounding pharmacy make my BP meds. He thinks that way I can avoid the fillers that may be causing the hives and swelling. People should know that alpha gal may trigger a reaction to chemicals in many medications.

A. Thank you for the warning. You are in good hands for alpha gal syndrome, since Dr. Scott Commins of the University of North Carolina is one of the world’s experts on this condition. He helped Dr. Platts-Mills with the discovery of this potentially life-threatening reaction to mammalian meat (beef, pork, lamb, rabbit, goat, etc.).

The reaction begins with the bite of a lone star tick. After that, exposure to red meat can cause a delayed allergic reaction that could range from hives or digestive distress to trouble breathing. The diagnosis can be confirmed with a blood test.

Prevention is the only available treatment: avoid eating meat. Some people must also avoid milk, cheese and yogurt. Highly sensitive individuals may be vulnerable to smoke from a barbecue. Even products containing carageenan could trigger a reaction.

Your note on medications is important. Few people react to pills, but medicines or vaccines that contain gelatin, glycerin, magnesium stearate or bovine extract can cause trouble for highly sensitive individuals. Heparin, heart valves from pigs or cows and monoclonal antibodies may also trigger an allergic response. You may want to listen to our recent interview with Dr. Commins and his colleague, gastroenterologist Sarah McGill. It is Show 1344: Managing Meat Allergy and Other Tick-Borne Diseases.

A Doctor Shares His Experience and Outrage:

We received a letter several years ago from a physician in North Carolina.

“Seven months ago I was bitten by a Lone Star tick. I now have the alpha-gal disorder.

“I’ve had 25 significant allergic reactions since then while I’ve learned to cope by avoiding things that cause attacks. I had serious problems for months before the diagnosis was made. Because of a variety of symptoms, I consulted family physicians, an internist, an ear, nose and throat specialist, a health department physician and a neurologist before my wife made the diagnosis while listening to a program about alpha-gal on The Peoples Pharmacy radio show.

“My symptoms were just as described on your radio program, and I had had a tick bite. I went to see an allergist and he told me I probably didn’t have alpha-gal because my symptoms were not typical, despite the fact that my blood test was 15 times higher than normal.

“When I spoke with each of the other physicians and told them what I had, they admitted they had never heard of the problem. What is wrong with this picture? When a life-threatening problem exists, it seems there is little professional education or knowledge of how to prevent, diagnose or treat it.

“During a typical attack my face, head, tongue and lips swell. The lips have gone to the point of bursting (requiring ice packs for six hours). I also suffer from cloudy thinking, visual disturbances, shortness of breath and increased phlegm, abdominal swelling, pain and eventually diarrhea.

“I take a course of steroids for the worst episodes and I take a daily antihistamine. I keep an EpiPen handy but have only come close to using it twice.

“I now go to a specialist who understands my condition. I have learned what causes the episodes. In my case that includes, in addition to all mammalian meats, at least these following ingredients: stearic acid (as in Advil and other pills), mono-, di- and triglycerides, glycerin, whey, milk, cheese, butter, gelatin and vitamin D3 (cholecalciferol) in some orange juice. Natural flavors made from meat products are found in lots of foods. I have my medicine made in vegetable capsules to avoid gelatin.

“I have a set of foods that I can eat safely and I stick with them carefully. A simple mistake will make me sick for a week. I’ve found great fish and fowl. I eat a lot of eggs. You can lead a really good life despite alpha-gal with education, but a casual approach to food won’t work.”

What to Learn from This Story:

People who live in areas where black legged ticks and lone star ticks are common must be aware of this potentially life-threatening reaction. In addition to pork, beef, lamb and venison, alpha-gal shows up in dairy products like ice cream and in gelatin found in Jell-O, marshmallows, gummy vitamins and many capsules. The only protection is avoidance.

You can listen for free to our most recent interview with Dr. Thomas Platts-Mills at this link:

Show 1003: From Lyme to Alpha-Gal: The Latest on Tick-Borne Diseases

If you experience symptoms of alpha-gal allergy, head for the emergency department pronto! And if the emergency physicians there are unfamiliar with this allergic condition, tell them to log onto our website and search for alpha-gal.

This article provides access to journal articles that will help your doctor better understand this still mysterious illness. Our earliest interview with Dr. Platts-Mills was in 2013. You can listen to our interview with Dr. Platts-Mills at this link (Show 830: Alpha-Gal Allergy). The mp3 download is free. We think you will find this radio show podcast fascinating because it is one of the first descriptions of alpha-gal syndrome anywhere in the world. Just download the free link.

You might also want to listen to more recent interviews. Show 1167: Will a Tick Bite Make You Allergic to Meat? is an interview with Scott Commins, MD, one of Dr. Platts-Mills’ colleagues. Show 1344: Managing Meat Allergy and Other Tick-Borne Diseases focuses more specifically on the gastrointestinal symptoms. You can also listen to our free podcast “Show 1380: Avoiding Lyme and Other Tick-Borne Diseases” for more information.

Share your own story about tick-borne illness below in the comment section. We would be so grateful if you would share this article with friends and family. You never know who might experience a tick bite this summer.

Now that we know the black-legged ticks can also transmit this allergy along with the lone star ticks, the syndrome is likely to continue spreading.