Losing your tonsils does appear to carry a small, long-term increase in certain types of infections, particularly upper respiratory illnesses. But the picture is more complicated than a simple yes or no. For people who had their tonsils removed because of chronic infections, the surgery usually means fewer sore throats, fewer doctor visits, and less antibiotic use in the years that follow. The trade-off is a modest uptick in the broader category of respiratory tract infections over the long haul, along with some measurable changes to your immune markers. Whether that trade-off matters depends heavily on why the tonsils were removed in the first place, how old you were at the time, and what “getting sick” means to you.
What Tonsils Actually Do for Your Immune System
Your palatine tonsils sit at the back of your throat, right where the air you breathe and the food you swallow converge. That position is not accidental. They act as immunological lookouts, sampling bacteria, viruses, and other foreign material as it passes through, then triggering immune responses tailored to those specific invaders.1PubMed. Novel Findings on the Development and Immunological Functions of Palatine Tonsils The tonsils contain specialized tissue compartments where both arms of the immune system get activated: the fast, general-purpose “innate” response and the slower, targeted “adaptive” response that produces antibodies.2PubMed. Morphology and immunology of the human palatine tonsil
One of the more interesting things tonsils do is seed the surrounding tissues with immune cells. B cells generated in the tonsils migrate outward to the nasal lining, the bronchial tubes, and the salivary and tear glands, where they produce a particular type of antibody called IgA that protects mucosal surfaces throughout the head and chest.3International Congress Series. Immunology of tonsils and adenoids: everything the ENT surgeon needs to know So when the tonsils are removed, you are not just losing two lumps of tissue at the back of your throat. You are removing a production center that supplies immune cells to a broader region.
That said, researchers now recognize that the relationship between tonsils and health is not purely protective. Chronically inflamed tonsils can become a source of systemic inflammation rather than a shield against it, essentially switching from helping you fight infection to fueling low-grade immune dysfunction.1PubMed. Novel Findings on the Development and Immunological Functions of Palatine Tonsils This dual nature is what makes the “do tonsils help or hurt?” question genuinely difficult to answer in the abstract.
The Large Population Studies on Long-Term Infection Risk
The most-cited research on this question comes from a massive Danish cohort study that followed over a million children for up to thirty years. It found that tonsillectomy was associated with roughly a threefold increase in diseases of the upper respiratory tract compared to children who kept their tonsils. Adenoidectomy alone (removal of the adenoids, the related tissue higher up behind the nose) roughly doubled the risk. The study also found a smaller but real increase in the broader category of infectious diseases: about a 17% higher risk after combined adenotonsillectomy, which translated to an absolute risk increase of about 2%.4PubMed Central. Association of Long-Term Risk of Respiratory, Allergic, and Infectious Diseases With Removal of Adenoids and Tonsils in Childhood
A Korean population-based study echoed these findings. Children who underwent adenotonsillectomy had modestly higher odds of hospital visits for both upper and lower respiratory tract infections throughout a three-year follow-up period, though the increases were small in absolute terms and the study found no significant association with influenza or pneumonia specifically.5Journal of Rhinology. The Impact of Adenotonsillectomy on Respiratory Tract Infections in Pediatric Patients
These numbers sound alarming, and they generated plenty of headlines. But context matters. The Danish study was observational, not a randomized trial. Children who end up getting tonsillectomies are already children who get sick a lot, and while the researchers used statistical methods to try to account for that, it is hard to fully separate the effect of the surgery from the underlying susceptibility of the kids who needed it. The study’s authors were careful to frame the findings as associations, not proof that removing tonsils caused the increased illness rates.
What Happens to Your Antibody Levels
One measurable consequence of tonsillectomy is a drop in certain antibody levels, and this is where the data gets more concrete. A study comparing children who had undergone tonsillectomy with healthy controls found dramatically lower levels of IgA, IgM, and IgG in the blood of the tonsillectomy group.6PubMed Central. Long-term impacts of tonsillectomy on children’s immune functions IgA is the main antibody defending your mucosal surfaces. IgG handles most of the work against blood-borne pathogens. IgM is typically the first responder when you encounter something new.
A prospective study of patients with chronic tonsillitis similarly found significant drops in immunoglobulin concentrations after surgery, particularly after tonsillectomy and combined adenotonsillectomy. The key reassurance from that study: even with the drops, levels stayed within normal physiological ranges.7PubMed Central. Systemic Immunoglobulin Changes Following Adenoidectomy, Tonsillectomy, and Adenotonsillectomy in Patients With Chronic Tonsillitis and Adenoiditis This is a meaningful distinction. A drop in antibodies does not necessarily mean immune deficiency. If the tonsils were chronically inflamed, some of that antibody production was driven by the ongoing infection itself rather than by healthy surveillance. Remove the infection source, and the immune system dials back to a lower but still functional baseline.
Research on saliva tells a slightly different story. After tonsillectomy, specific IgG antibodies in saliva dropped, suggesting the tonsils do participate in local immune defense in the mouth. But the overall capacity of saliva to fight off pathogens did not seem to suffer in a lasting way: most of the non-antibody defense factors in saliva held steady.8Clinical Immunology and Immunopathology. Longitudinal Analysis of Human Salivary Immunoglobulins, Nonimmune Antimicrobial Agents, and Microflora after Tonsillectomy
The Upside: Fewer Sore Throats and Less Time at the Doctor
If you are someone who keeps getting strep throat, the math on tonsillectomy tends to favor surgery. A randomized trial in adults with recurrent strep pharyngitis found that at 90 days, strep had come back in about a quarter of the watchful-waiting group but only 3% of the tonsillectomy group. The tonsillectomy group also had fewer total episodes of pharyngitis and fewer days with throat pain and fever over the follow-up period.9PubMed. Tonsillectomy versus watchful waiting in recurrent streptococcal pharyngitis in adults: randomised controlled trial
In children, a systematic review found that tonsillectomized kids had fewer sore throat days, fewer strep infections, and fewer school absences in the first year after surgery compared to kids managed with watchful waiting. The benefit was clear in the short term but tended to fade over the longer run, partly because the watchful-waiting group also improved over time as kids naturally outgrew their susceptibility.10PubMed Central. Tonsillectomy Versus Watchful Waiting for Recurrent Throat Infection: A Systematic Review
For adults with recurrent tonsillitis, the quality-of-life improvements can be substantial. One study found that after tonsillectomy, the average number of doctor visits per year for sore throat dropped from five to one, episodes of sore throat went from seven to two, and days off work plummeted from twelve to one per year.11PubMed Central. Recurrent tonsillitis in adults: quality of life after tonsillectomy So while you may technically be exposed to a slightly higher risk of general respiratory infections without your tonsils, you are much less likely to be laid out by the specific recurring throat infections that made you miserable enough to have them removed.
Does the Body Compensate?
Your tonsils are part of a ring of lymphoid tissue called Waldeyer’s ring that encircles the top of your throat. When the palatine tonsils are removed, the remaining components, especially the lingual tonsil at the base of the tongue, may partially pick up the slack. One study found that children who had previously undergone tonsillectomy had a much higher prevalence of visible lingual tonsil tissue compared to children with intact palatine tonsils (roughly 78% versus 22%).12JAMA Otolaryngology–Head & Neck Surgery. Factors Associated With Hypertrophy of the Lingual Tonsils in Adults With Sleep-Disordered Breathing This suggests the body recognizes the gap and tries to fill it, though the extent to which lingual tonsil growth actually restores immune function is not well established.
Meanwhile, a study looking specifically at very young children (under three years old) who underwent adenoidectomy with or without tonsillectomy reported no recurrent respiratory tract infections or immune deficiency conditions during the entire follow-up period.13PubMed Central. Short- and long-term impacts of adenoidectomy with/without tonsillectomy on immune function of young children <3 years of age That finding is worth noting because very young children are the group whose immune systems are least mature and theoretically most vulnerable to the loss of immune tissue. Yet even in that population, the practical consequences were minimal.
Autoimmune Disease and Cancer Signals
Beyond infections, some research has flagged associations between tonsillectomy and longer-term health conditions. A large Swedish cohort study found that people who had undergone tonsillectomy were about a third more likely to be diagnosed with an autoimmune disease than the general population. The increase was consistent across gender, age at surgery, and the original reason for the operation.14Journal of Autoimmunity. Tonsillectomy associated with an increased risk of autoimmune diseases: A national cohort study
Inflammatory bowel disease has drawn particular attention. A meta-analysis found that tonsillectomy was associated with an increased risk of Crohn’s disease.15PubMed. Tonsillectomy and the risk of inflammatory bowel disease: A systematic review and meta-analysis A more recent cohort study using U.S. data found a roughly 30% higher risk of developing inflammatory bowel disease overall after tonsillectomy, with elevated risks for both Crohn’s disease and ulcerative colitis.16PubMed. Tonsillectomy and the Risk of Inflammatory Bowel Disease: A Retrospective Cohort Study Using Real-World US Data
On the cancer side, a Swedish population-based study using sibling comparisons found a modestly elevated risk of cancer overall after tonsillectomy or adenoidectomy, with a hazard ratio of about 1.10 to 1.15 depending on the comparison group. The association persisted more than two decades after surgery and did not vary much by age at surgery or type of operation.17PubMed Central. Cancer risk following surgical removal of tonsils and adenoids – a population-based, sibling-controlled cohort study in Sweden A Taiwanese cohort study found a somewhat larger overall effect but noted that when individual cancer types were examined separately, none reached statistical significance after adjusting for other health factors.18PubMed. A nationwide population-based cohort study on tonsillectomy and subsequent cancer incidence
These findings are important to put in perspective. The absolute risk increases are small. Most people who have had a tonsillectomy will never develop Crohn’s disease or cancer as a result. And all of these studies are observational: they cannot prove the surgery caused the increased risk, and the possibility remains that underlying genetic or immune factors that led to the tonsil problems in the first place also predispose to these later conditions. Still, the consistency of the signal across multiple large studies and different populations is hard to dismiss entirely.
Partial Tonsillectomy as a Middle Ground
Given the evidence that tonsils contribute to immune defense, a natural question is whether you can get the benefits of surgery while leaving some functional tissue behind. Partial (or “intracapsular”) tonsillectomy does exactly that, shaving down the tonsil tissue rather than removing it completely. In theory, this preserves some immune function while resolving the obstruction or recurrent infection that prompted surgery.
In practice, a five-year randomized trial comparing partial and total tonsillectomy for recurrent tonsillitis found that partial removal was not inferior: no cases of bacterial inflammation were observed in the remaining tissue during the first year, and that held steady over the full five-year follow-up.19PubMed. Total versus subtotal tonsillectomy for recurrent tonsillitis: 5-year follow up of a prospective randomized noninferiority clinical trial A separate long-term comparison found no significant differences in upper respiratory infections treated with antibiotics between the two approaches over six years.20International Journal of Pediatric Otorhinolaryngology. Long-term effects of intracapsular partial tonsillectomy (tonsillotomy) compared with full tonsillectomy
A systematic review was more cautious, noting that while partial tonsillectomy offered moderate advantages in recovery time and return to normal diet, it also came with a risk of tonsillar regrowth and symptom recurrence. The overall data did not allow firm conclusions about whether partial removal was clearly better.21PubMed Central. Comparative Effectiveness of Partial Versus Total Tonsillectomy in Children: A Systematic Review The practical takeaway is that partial tonsillectomy appears to work about as well as total removal for most outcomes, with a faster recovery, but whether it meaningfully preserves immune function remains an open question that the existing studies have not directly tested.
What Happens to the Bacteria in Your Throat
Your throat hosts a complex community of bacteria, and removing the tonsils reshapes that landscape. A study of throat flora before and after tonsillectomy found that most of the normal aerobic bacteria stayed the same, but one major anaerobic species dropped significantly while another increased.22PubMed. Oropharyngeal flora changes after tonsillectomy Importantly, the rate of potentially pathogenic bacteria did not change after surgery, suggesting that the overall defensive ecology of the throat remains largely intact even without tonsils.
A more detailed study using modern sequencing techniques in children undergoing adenotonsillectomy for obstructive sleep apnea found that the overall diversity of oral bacteria stayed about the same after surgery, though the specific community composition shifted. For most patients, the shifts were not dramatic. Only in children with the most severe sleep apnea were significant changes seen in specific bacterial groups.23PubMed Central. Changes in the nasopharyngeal and oropharyngeal microbiota in pediatric obstructive sleep apnea before and after surgery The microbiome reshuffles a bit, but the throat does not become a bacterial free-for-all.
Allergies and Asthma After Tonsillectomy
Because tonsils are involved in immune regulation, people sometimes worry that removing them will trigger new allergies or worsen asthma. The evidence here is reassuring in most respects. A study of adults who had undergone adenoidectomy or tonsillectomy found no relationship between the surgery and allergic rhinitis in adulthood.24PubMed Central. Is Adenoidectomy and/or Tonsillectomy a Risk Factor for Allergic Diseases and Asthma in Adulthood? In children who already had allergic symptoms before surgery, one study actually found that allergy and asthma symptoms improved in the surgery group but not in the non-surgical controls.25PubMed. The influence of tonsillectomy on allergic diseases in pediatric patients
For asthma specifically, a large longitudinal study using national data found that tonsillectomy did not change the frequency of asthma diagnoses in the years following surgery.26Scientific Reports. Tonsillectomy does not reduce asthma in children: A longitudinal follow-up study using a national sample cohort The Danish cohort study mentioned earlier did find an increase in allergic diseases after adenoidectomy, but the signal for tonsillectomy specifically was weaker.4PubMed Central. Association of Long-Term Risk of Respiratory, Allergic, and Infectious Diseases With Removal of Adenoids and Tonsils in Childhood On balance, the fear that losing your tonsils will give you allergies or make your asthma worse does not hold up well across the research.
How Tonsillectomy Rates Have Changed and Why It Matters
The history of tonsillectomy is useful here because it explains why so many adults walking around today have had the surgery under circumstances that would not meet modern guidelines. In the late 1950s and 1960s, tonsillectomy was the most commonly performed surgical procedure in the United States. The prevailing theory was that tonsils could act as “portals of infection” seeding disease throughout the body, so removing them was seen as a broadly preventive measure.27Journal of the History of Medicine and Allied Sciences. The Rise and Decline of Tonsillectomy in Twentieth-Century America By the late 1960s in England, 120 out of every 10,000 children were having their tonsils removed in a given year. That rate dropped sharply over the following decades as evidence accumulated that the surgery was being dramatically overused.28PubMed. Tonsillectomy
Today, the surgery is performed far more selectively, typically reserved for children and adults with severe recurrent infections or significant airway obstruction from enlarged tonsils. This shift means that people having tonsillectomies now are more likely to be the ones who genuinely benefit, whereas many of those who had the surgery decades ago may not have needed it. If you are an adult who had your tonsils removed as a child in the era of routine tonsillectomy and you have been healthy ever since, the odds are good that your immune system adapted just fine. A comprehensive review concluded that while tonsil removal can lead to an increased incidence of certain infectious diseases, it does not appear to negatively affect cellular and humoral immunity in a clinically meaningful way for most people.29PubMed Central. Effects of tonsillectomy and adenoidectomy on the immune system
Short-Term Surgical Risks
Any discussion of whether you are “sicker” without tonsils should include the immediate surgical period, since the first couple of weeks after tonsillectomy carry their own set of risks. Post-operative bleeding is the most serious acute concern. A large pediatric case series reported bleeding rates ranging from under 2% with newer intracapsular techniques up to about 15% with traditional extracapsular coblation methods. Post-operative infection rates were low across the board, under about 2% regardless of technique.30PubMed Central. Short-Term Outcomes of Tonsillectomy in Large Paediatric Case Series These risks are well-managed in modern surgical settings, but they are a reminder that the surgery itself is not trivial, even if the long-term immune consequences appear to be modest for most people.