Is Autoimmune Gastritis Deadly? Risks & Life Expectancy
At a Glance
Autoimmune gastritis is generally not deadly. With proper treatment and routine endoscopies, most patients have a normal life expectancy. However, if left untreated, it can cause severe vitamin B12 deficiency, irreversible nerve damage, and a slightly higher risk of stomach tumors.
In this answer
3 sections
Autoimmune gastritis (AIG) is generally not considered a deadly disease. With proper treatment and regular monitoring, most people with AIG live full, normal lives. The condition itself is slow-moving and manageable. However, if left untreated or unmonitored, AIG can lead to serious complications that carry significant health risks.
Understanding these risks and actively managing them is the key to preventing them from becoming life-threatening. The main concerns associated with AIG fall into two categories: complications from severe nutrient deficiencies and an increased risk of certain stomach tumors.
The Risks of Nutrient Deficiencies
In AIG, your immune system mistakenly attacks parietal cells in your stomach lining [1]. These cells produce stomach acid and a protein called intrinsic factor, both of which are critical for absorbing essential nutrients [2][3]. Over time, this damage leads to two primary deficiencies:
- Iron Deficiency Anemia: The loss of stomach acid makes it extremely difficult for your body to absorb iron from food [4][5]. This often happens years before a B12 deficiency and is very common in AIG patients [6]. It can cause profound fatigue, weakness, and shortness of breath.
- Pernicious Anemia (Vitamin B12 Deficiency): Without intrinsic factor, your body cannot absorb vitamin B12 through normal digestion [1]. Untreated, this leads to pernicious anemia, which can cause severe drops in red blood cells that strain your heart [7][8].
- Irreversible Nerve Damage: Vitamin B12 is also essential for your nervous system. A severe deficiency can cause extreme damage to the spinal cord (a condition called subacute combined degeneration) [9][10]. Early symptoms include numbness, tingling, and unsteadiness. While early treatment can reverse these symptoms, delaying treatment can result in permanent, debilitating nerve damage [11][12].
Fortunately, routine blood tests and nutrient replacement therapy effectively prevent these complications [13][11]. While B12 is often given via injections, very high-dose oral pills can also work by forcing a small amount of the vitamin directly into the bloodstream, bypassing the stomach’s normal absorption process.
Increased Risk of Stomach Tumors
AIG causes long-term inflammation and changes to your stomach lining, which slightly increases the risk of developing two types of stomach growths:
- Gastric Neuroendocrine Tumors (Type 1 gNETs): These are usually small, slow-growing tumors that form in the stomach [14][15]. They are the most common type of tumor linked to AIG and rarely spread to other parts of the body.
- Gastric Adenocarcinoma (Stomach Cancer): There is an elevated risk of developing this more serious form of stomach cancer [16][17]. However, recent studies suggest that for many patients, the actual risk of adenocarcinoma remains relatively low and may not be significantly higher than the general population [18][19].
Because of these risks, gastroenterologists recommend regular endoscopic surveillance (an upper endoscopy), typically every 3 to 5 years depending on your doctor’s assessment of your individual risk [20][21]. During an endoscopy, a doctor uses a small camera to examine your stomach lining and take biopsies. This monitoring is crucial because it allows doctors to detect and treat any precancerous changes or tumors early, long before they become dangerous [22][23]. Interestingly, the presence of pernicious anemia often leads to an earlier diagnosis of stomach cancer, resulting in a more favorable clinical outcome if cancer does develop [24].
Looking Ahead
To ensure a healthy, normal life expectancy with AIG, proactive management is essential. This means consistently taking your prescribed B12 and iron supplements and attending all scheduled endoscopy appointments. Once nutrient levels are restored, most patients find that their energy returns and they can live their day-to-day lives without severe limitations.
Because AIG is an autoimmune disease, it also frequently co-exists with other autoimmune conditions, such as autoimmune thyroid disease or type 1 diabetes [25][26]. Monitoring your overall health with your care team will help ensure that any issues are caught and treated promptly, allowing you to live a long and healthy life.
Common questions in this guide
Is autoimmune gastritis fatal?
What happens if autoimmune gastritis goes untreated?
Does autoimmune gastritis cause stomach cancer?
How often should I get an endoscopy for autoimmune gastritis?
Can I take B12 pills instead of injections for AIG?
Questions to Ask Your Doctor
Curated prompts to bring to your next appointment.
- 1.Should I take B12 injections, or are high-dose oral pills a safe alternative for my specific case?
- 2.Based on my current biopsy results, what is my specific timeline for future endoscopic surveillance?
- 3.Are my current iron and B12 supplementation plans effectively protecting my nerve health and red blood cell count?
- 4.Should I be tested for other common autoimmune conditions, such as thyroid disease or type 1 diabetes, given my AIG diagnosis?
- 5.What specific symptoms—neurological or digestive—should prompt me to contact you between my regularly scheduled screenings?
Questions For You
Tap a prompt to share your answer — we'll use it plus this page's context to start a tailored conversation.
Related questions
References
References (26)
- 1
Pernicious Anemia: The Hematological Presentation of a Multifaceted Disorder Caused by Cobalamin Deficiency.
Esposito G, Dottori L, Pivetta G, et al.
Nutrients 2022; (14(8)) doi:10.3390/nu14081672.
PMID: 35458234 - 2
Neurological disorders in vitamin B12 deficiency.
Pavlov CS, Damulin IV, Shulpekova YO, Andreev EA
Terapevticheskii arkhiv 2019; (91(4)):122-129 doi:10.26442/00403660.2019.04.000116.
PMID: 31094486 - 3
Creating a Framework for Treating Autoimmune Gastritis-The Case for Replacing Lost Acid.
Taylor L, McCaddon A, Wolffenbuttel BHR
Nutrients 2024; (16(5)) doi:10.3390/nu16050662.
PMID: 38474790 - 4
Is achlorhydria a cause of iron deficiency anemia?
Betesh AL, Santa Ana CA, Cole JA, Fordtran JS
The American journal of clinical nutrition 2015; (102(1)):9-19 doi:10.3945/ajcn.114.097394.
PMID: 25994564 - 5
Autoimmune gastritis.
Kulnigg-Dabsch S
Wiener medizinische Wochenschrift (1946) 2016; (166(13-14)):424-430 doi:10.1007/s10354-016-0515-5.
PMID: 27671008 - 6
Autoimmune gastritis: relationships with anemia and Helicobacter pylori status.
Villanacci V, Casella G, Lanzarotto F, et al.
Scandinavian journal of gastroenterology 2017; (52(6-7)):674-677 doi:10.1080/00365521.2017.1288758.
PMID: 28276835 - 7
A Case of Pseudothrombotic Microangiopathy Associated with Pernicious Anemia.
Wathieu H, Bateman KM
Journal of general internal medicine 2021; (36(6)):1775-1777 doi:10.1007/s11606-020-06588-2.
PMID: 33620630 - 8
Pernicious Anemia and Vitamin B12 Deficiency Presenting As Pseudothrombotic Microangiopathy and Developing Secondary Thrombocytopenia After Treatment: A Case Report.
Abosheaishaa H, Nassar M, Ghallab M, et al.
Cureus 2022; (14(12)):e32095 doi:10.7759/cureus.32095.
PMID: 36601163 - 9
A case report: subacute combined degeneration of the spinal cord and pernicious anemia caused by autoimmune gastritis.
Sun Z, Yu X
Medicine 2022; (101(26)):e29226 doi:10.1097/MD.0000000000029226.
PMID: 35777065 - 10
SUBACUTE COMBINED DEGENERATION OF THE SPINAL CORD SECONDARY TO NITROUS OXIDE-INDUCED B12 DEFICIENCY.
Shariff M, Abdallah A, Salam A, Fathima S
European journal of case reports in internal medicine 2023; (10(3)):003765 doi:10.12890/2023_003765.
PMID: 36969521 - 11
Skin pigmentation in a patient with vitamin B12 deficiency presented with subacute combined degeneration of spinal cord.
Sarwar AK, Zafar MU, Rehman Abid Butt MU
JPMA. The Journal of the Pakistan Medical Association 2020; (70(1)):174-177 doi:10.5455/JPMA.23581.
PMID: 31954048 - 12
Subacute Combined Degeneration of the Spinal Cord and Hydrocephalus Associated with Vitamin B12 Deficiency.
Sun W, Li G, Lai Z, et al.
World neurosurgery 2019; (128()):277-283 doi:10.1016/j.wneu.2019.05.008.
PMID: 31082549 - 13
Pernicious anemia: Pathophysiology and diagnostic difficulties.
Htut TW, Thein KZ, Oo TH
Journal of evidence-based medicine 2021; (14(2)):161-169 doi:10.1111/jebm.12435.
PMID: 34015185 - 14
Autoimmune metaplastic atrophic gastritis and association with neuroendocrine tumors of the stomach.
Nehme F, Rowe K, Palko W, et al.
Clinical journal of gastroenterology 2020; (13(3)):299-307 doi:10.1007/s12328-019-01074-7.
PMID: 31782113 - 15
Progression From Antral G-Cell Hyperplasia to Gastric Neuroendocrine Tumor in a Patient With Autoimmune Gastritis.
Brown P, Tetali B, Suresh S, Varma A
ACG case reports journal 2021; (8(8)):e00649 doi:10.14309/crj.0000000000000649.
PMID: 34476276 - 16
Multifocal early gastric cancer in a patient with atrophic gastritis and pernicious anemia.
Zurleni T, Altomare M, Serio G, Catalano F
International journal of surgery case reports 2020; (72()):433-437 doi:10.1016/j.ijscr.2020.06.010.
PMID: 32563836 - 17
Incidence and Predictors of Gastric Neoplastic Lesions in Corpus-Restricted Atrophic Gastritis: A Single-Center Cohort Study.
Dilaghi E, Dottori L, Pivetta G, et al.
The American journal of gastroenterology 2023; (118(12)):2157-2165 doi:10.14309/ajg.0000000000002327.
PMID: 37207305 - 18
Long-Term Natural History of Autoimmune Gastritis: Results From a Prospective Monocentric Series.
Miceli E, Lenti MV, Gentile A, et al.
The American journal of gastroenterology 2024; (119(5)):837-845 doi:10.14309/ajg.0000000000002619.
PMID: 38050966 - 19
Autoimmune gastritis may be less susceptible to cancer development than Helicobacter pylori-related gastritis based on histological analysis.
Arai J, Niikura R, Hayakawa Y, et al.
Gut 2024; (73(6)):1037-1038 doi:10.1136/gutjnl-2023-330052.
PMID: 37197906 - 20
Endoscopic Features of Early-stage Autoimmune Gastritis.
Kato M
Internal medicine (Tokyo, Japan) 2020; (59(23)):2969-2970 doi:10.2169/internalmedicine.5603-20.
PMID: 32759598 - 21
The incidence of neoplasia in patients with autoimmune metaplastic atrophic gastritis: a renewed call for surveillance.
Mahmud N, Stashek K, Katona BW, et al.
Annals of gastroenterology 2019; (32(1)):67-72 doi:10.20524/aog.2018.0325.
PMID: 30598594 - 22
Autoimmune Atrophic Gastritis: A Clinical Review.
Castellana C, Eusebi LH, Dajti E, et al.
Cancers 2024; (16(7)) doi:10.3390/cancers16071310.
PMID: 38610988 - 23
Gastric lesions in patients with autoimmune metaplastic atrophic gastritis: a retrospective study in a single center.
Hu H, Li R, Shao L, et al.
Scandinavian journal of gastroenterology 2022; (57(11)):1296-1303 doi:10.1080/00365521.2022.2081061.
PMID: 35645153 - 24
Gastric cancer in autoimmune gastritis: A case-control study from the German centers of the staR project on gastric cancer research.
Weise F, Vieth M, Reinhold D, et al.
United European gastroenterology journal 2020; (8(2)):175-184 doi:10.1177/2050640619891580.
PMID: 32213076 - 25
Polyglandular Syndrome Type III and Severe Peripheral Neuropathy: An Unusual Association.
de Sousa AWP, da Silva VM, Fernandes PA, et al.
GE Portuguese journal of gastroenterology 2015; (22(1)):15-18 doi:10.1016/j.jpge.2014.08.001.
PMID: 28868363 - 26
Time course and risk factors of evolution from potential to overt autoimmune gastritis.
Lenti MV, Miceli E, Vanoli A, et al.
Digestive and liver disease : official journal of the Italian Society of Gastroenterology and the Italian Association for the Study of the Liver 2022; (54(5)):642-644 doi:10.1016/j.dld.2021.10.001.
PMID: 34732311
This page is for educational purposes only and does not replace professional medical advice. Always consult your gastroenterologist to discuss your specific prognosis, symptoms, and endoscopy screening schedule.
Get notified when new evidence is published on autoimmune gastritis.
We monitor PubMed for new peer-reviewed studies on this topic and email a short summary when something meaningful changes.