Se and Canker sores - a phase IV clinical study of FDA data

Summary:

Canker sores is reported as a side effect among people who take Se (selenium), especially for people who are female, 60+ old, also take Vitamin D3, and have Narcolepsy.

The phase IV clinical study analyzes which people have Canker sores when taking Se. It is created by eHealthMe based on reports of 5,331 people who have side effects when taking Se from the FDA, and is updated regularly.

What is Se?

Se has active ingredients of selenium. eHealthMe is studying from 5,604 Se users. Check the latest studies of Se.

What is Canker sores?

Canker sores (painful, open sore in the mouth) is found to be associated with 613 drugs and 1,227 conditions by eHealthMe. Check the latest studies of Canker sores.

On Jul, 22, 2026

5,331 people reported to have side effects when taking Se.
Among them, 11 people (0.21%) have Canker sores.

Among these 11 people:

What is the gender of people who have Canker sores when taking Se? *

female: 63.64 %
male: 36.36 %

What is the age of people who have Canker sores when taking Se? *

What are other drugs people take besides Se? *

What are other side effects people have besides Canker sores? *

Weight Decreased: 7 people, 63.64%
Back Pain: 6 people, 54.55%
Stress And Anxiety: 6 people, 54.55%
Stomatitis (inflammation of mucous membrane of mouth): 5 people, 45.45%
Insomnia (sleeplessness): 4 people, 36.36%
Flatulence (flatus expelled through the anus): 4 people, 36.36%
Exostosis (formation of new bone on the surface of a bone): 4 people, 36.36%
Intervertebral Disc Protrusion (spinal disc protrusion): 4 people, 36.36%
Constipation: 4 people, 36.36%
Nausea (feeling of having an urge to vomit): 4 people, 36.36%

What are the existing conditions these people have? *

Narcolepsy (brain's inability to regulate sleep-wake cycles normally): 5 people, 45.45%
Sleep Disorder: 2 people, 18.18%
Neoplasm Malignant (cancer tumour): 2 people, 18.18%
High Blood Pressure: 2 people, 18.18%
Chronic Lymphocytic Leukaemia (cancer in which the bone marrow makes too many lymphocytes (a type of white blood cell)): 2 people, 18.18%
Waldenstrom's Macroglobulinaemia (cancer affects small lymphocytes (white blood cells)): 1 person, 9.09%
Cataplexy (loss of muscle tone accompanied by full conscious awareness): 1 person, 9.09%
Acute Myeloid Leukaemia (acute cancer in which the bone marrow makes abnormal myeloblasts): 1 person, 9.09%

* Approximation only. Some reports may have incomplete information.

Do you take Se and have Canker sores?

- Check whether Canker sores is associated with a drug or a condition
- Predict drug outcomes for up to one year with AI
- Get an AI agent to monitor your drugs continuously

Related studies:

Effectiveness of, long term effects of, and alternative drugs to Se:

Se (5,604 reports)

Canker sores treatments and more:

Canker sores (9,953 reports)

Browse all side effects of Se:

a b c d e f g h i j k l m n o p q r s t u v w x y z

Browse all the drugs that are associated with Canker sores:

Canker sores (613 drugs)

Browse all the conditions that are associated with Canker sores:

Canker sores (1,227 conditions)

How the study uses the data?

The study uses data from the FDA. It is based on selenium (the active ingredients of Se) and Se (the brand name). Other drugs that have the same active ingredients (e.g. generic drugs) are not considered. Dosage of drugs is not considered in the study.

How to use the study?

DO NOT STOP MEDICATIONS without first consulting your doctor. If there are any serious or long term adverse effects discovered in the study, discuss the study with your doctor to ensure that proper medication management will be in place if applicable.

Who is eHealthMe?

With medical big data and proven AI/ML algorithms, eHealthMe provides a platform for everyone to run phase IV clinical trials. We study millions of patients and 5,000 more each day. Results of our real-world drug study have been referenced on 800+ peer-reviewed medical publications, including The Lancet, Mayo Clinic Proceedings, and Nature. Our analysis results are available to researchers, health care professionals, patients (testimonials), and software developers (open API).

WARNING, DISCLAIMER, USE FOR PUBLICATION

WARNING: Please DO NOT STOP MEDICATIONS without first consulting a physician since doing so could be hazardous to your health.

DISCLAIMER: All material available on eHealthMe.com is for informational purposes only, and is not a substitute for medical advice, diagnosis, or treatment provided by a qualified healthcare provider. All information is observation-only. Our phase IV clinical studies alone cannot establish cause-effect relationship. Different individuals may respond to medication in different ways. Every effort has been made to ensure that all information is accurate, up-to-date, and complete, but no guarantee is made to that effect. The use of the eHealthMe site and its content is at your own risk.

If you use this eHealthMe study on publication, please acknowledge it with a citation: study title, URL, accessed date.