You might have a complicated candidiasis if: You could have severe symptoms, such as considerable redness, itching and swelling that leads to tears or cracks (fissures) or sores. You might have four or more yeast-based infections in a year. Your infection is the effect of a kind of candida other than Candida albicans.
- have severe redness, swelling, and itching that leads to sores or tears in your vaginal tissue. have had more than four yeast infections in a year. have contamination caused by Candida apart from Candida albicans.
- The most frequent symptoms of a yeast infection are itching and vaginal discharge.. Severe yeast-based infections may cause swelling of the labia (lips) beyond the vagina.
- Sometimes a more complicated yeast infection may occur, with an increase of severe symptoms. Four or even more infections may arise in a single year.
- Fishy vaginal odors are more common with bacterial vaginosis, a kind of bacterial infection of the vagina.
- Vaginal itching, irritation, and discharge could mean you have an infection from yeast, but they can be symptoms of something else.
Can An Infection From Yeast Be Serious?
Under normal circumstances, a vaginal yeast infection is not serious and can be treated with medications. However, a vaginal candidiasis can be considered a sign an underlying, much more serious condition or can lead to serious complications, especially if left untreated. 
Can I Give My Partner An Infection From Yeast?
For example, if you have thrush and perform oral sex on another person, you can potentially give that person an infection from yeast. However, giving your partner an infection from yeast really isn’t all that common.