Itching that keeps coming back after intimacy, settles with treatment and then returns usually means the underlying cause has not been fully identified, or that both partners were not treated. Recurrent yeast infection is the commonest reason, but a contact reaction to condoms, lubricants or spermicide, and dryness from low oestrogen, produce a similar pattern. Repeated short courses of medicine without a diagnosis is what allows this to keep cycling.
Next Steps
Your wife should see a gynaecologist for an examination and a vaginal swab while the symptoms are present, which is when the test is most useful. Blood
sugar is also worth checking, as recurrent yeast infection can be the first clue to it.
Health Tips
Avoid intimate washes and douching. If a partner infection is confirmed, both of you need treating at the same time to break the cycle.