The short explanation
Yes, it is reasonable to ask for a sugar test if you keep getting thrush. Thrush is caused by Candida yeast, which grows more easily when blood sugar is high. Repeated thrush can sometimes be an early sign of diabetes or prediabetes, especially if you also have increased thirst, passing urine often, tiredness or weight change, or diabetes runs in your family. The usual tests are a fasting blood sugar and HbA1c, which reflects average sugar over the past few months. They are inexpensive and widely available, including at government hospitals and PHCs. Many women with repeated thrush have normal sugar levels, and other reasons, such as antibiotics, hormones or a less common yeast type, are also checked.
What depends on your situation
The parts of this that change from woman to woman. Uncertainty is stated, not hidden.
- PCOS, being overweight and a family history of diabetes increase the chance of raised sugar in younger women.
- A swab confirms that the infection is thrush and not bacterial vaginosis or another cause.
- If sugar is raised, controlling it often reduces how often thrush returns.
What this answer cannot determine
The boundary of online education. These need a clinician who can see you.
- This cannot tell you whether your sugar is raised. A blood test can.
Questions for your clinician
Take these with you. You can add any of them to an appointment card.
- Should I have a fasting sugar and HbA1c test?
- Can you confirm with a swab that this is thrush?
- What else could be causing repeated infections?
- If my sugar is normal, what are the next steps?
When to seek help
Clinician-approved guidance for this topic. When in doubt, being seen is never the wrong choice.
Book an appointment soon
- See a clinician within a few days if you have thrush along with marked thirst, passing urine very often or weight loss.
Raise it at a routine appointment
- Book a routine visit to discuss repeated thrush and a sugar test. Government hospitals and PHCs offer gynaecology consultations and basic swab tests at low or no cost.
Sources
The evidence this explanation is built on.
- Vaginal yeast infection MedlinePlus (NIH)
- Vaginal thrush NHS
Who wrote and reviewed this
Every AskHer answer names its author. A clinically reviewed answer also names the clinician who signed it off — if no clinician is named below, it has not been clinically reviewed.
- Author
- AskHer Editorial (AI-assisted draft) AskHer's editorial team — not an individual clinician Works in English, தமிழ், हिन्दी
- Clinical reviewer
- Nobody yet No clinician has signed this answer off, and no person on the editorial team has read it yet. That is what the “Written with AI assistance” label means. It is queued for an editor to read, and then for a clinician who works in this area. The sources it was drafted against are listed above.
- Review status
- Written with AI assistance — not yet reviewed by a person
- Last reviewed
- Not yet reviewed by a person
- Version
- 1
Correction history
Substantive changes are listed, not quietly edited away.
No corrections have been made since this answer was first published.
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