Candida and Candidiasis: Symptoms, Diagnosis, Treatment and the Difference from SIFO

01 · When is Candida natural, and when does it cause infection?

Candida is a genus of yeasts that can occur on the skin and in the mouth, gut and vagina. Finding Candida without corresponding symptoms does not necessarily mean disease or a need for treatment.

Colonisation means that a microorganism is present without proven disease. Candidiasis is an infection assessed according to its location, symptoms and appropriate testing. Skin or vaginal infections differ substantially from a serious bloodstream infection.

02 · What increases the risk of candidiasis?

Risk factors depend on the type of infection. They include recent antibiotic use, weakened immunity, diabetes and certain corticosteroids. Pregnancy and hormonal changes can increase the risk of vaginal candidiasis. Dentures and inhaled corticosteroids may contribute to oral thrush.

Invasive candidiasis mainly affects seriously ill hospital patients, for example after surgery or with a central venous catheter. Fatigue alone in an otherwise healthy person does not indicate this serious infection.

03 · Symptoms depend on the site of infection

• Mouth and throat: white patches, redness or soreness.
• Vagina: itching, soreness and discharge. Other conditions can cause similar symptoms.
• Oesophagus: painful or difficult swallowing, more often in people with weakened immunity.
• Skin folds: redness and irritation, which a clinician must distinguish from other skin conditions.
• Invasive infection: fever and chills in a person with significant risk factors, requiring medical assessment.

04 · Candida in the gut and SIFO are different

Finding yeast in a stool sample does not by itself prove an infection of the small intestine. SIFO stands for small intestinal fungal overgrowth, a condition being studied in relation to digestive symptoms. Bloating, abdominal pain and changes in bowel habits are not specific to SIFO and can occur with many other conditions.

Research describes sampling fluid from the small intestine and culturing it for fungi. This is an invasive procedure with limited availability and diagnostic limitations. SIFO cannot reliably be diagnosed from a home test, a photograph of a drop of blood or symptoms alone. Standard hydrogen or methane breath tests do not detect fungal overgrowth.

05 · How is candidiasis diagnosed?

A clinician chooses tests according to the symptoms and affected area. These may include a targeted swab, laboratory microscopy, culture or other methods. Suspected invasive infection requires blood testing or a sample from the affected site. Results must be interpreted alongside the clinical picture because Candida can also be naturally present.

06 · Treatment, diet and probiotics

Confirmed candidiasis is treated with antifungal medicines selected according to the site, severity and individual circumstances. Treatment may be topical, oral or intravenous in hospital. Persistent or recurring symptoms require medical assessment; repeated self-treatment can delay identification of another cause.

Strictly eliminating sugar, fruit or grains has not been shown to cure candidiasis on its own. A varied diet supports general health but does not replace diagnosis or necessary antifungal treatment. The fact that Candida can use glucose in a laboratory does not establish that a restrictive diet treats infection in people.

Probiotics are not a universal treatment for candidiasis. CDC guidance states that there is no substantial evidence supporting probiotics for treating vulvovaginal candidiasis. Some studies investigate their use alongside treatment, but results cannot automatically be applied to every strain or product. CDC treatment guidance.

For people with diabetes, appropriate blood glucose management is part of addressing risk factors. Antibiotics should be used only when clinically indicated; do not stop a prescribed course without discussing it with your clinician.

07 · Invasive candidiasis and Candida auris

Invasive candidiasis is a serious infection of the blood or internal organs, mainly affecting people with substantial health risks in hospital. It requires prompt medical investigation and treatment. Candida auris is particularly important in healthcare settings because it can spread and may be resistant to antifungal medicines.

These infections should be distinguished from common vaginal or oral candidiasis and from the mere presence of Candida in the gut.

08 · Natural substances: what does the research show?

A laboratory experiment, an animal study and a clinical trial in people provide different levels of evidence. Inhibiting yeast in a test tube does not prove that taking a substance safely and effectively treats an infection.

09 · Boric acid: a specific local treatment

CDC guidance includes vaginal boric acid for selected recurrent non-albicans infections after assessment of previous treatment. It is not a dietary supplement or a universal approach to candidiasis.

Frequently asked questions