You can't get fungus from the cup itself. However, regular soap can change the naturally acidic PH of the vagina. And if the acidity level gets too high, it can lead to imbalances and fungus in the lower abdomen. That's why it's so important not to use regular soap in and around the vagina.
If you wash your menstrual cup with soap and water, it's important to avoid soap residue going with the cup into the vagina. You can do this by rinsing the cup very thoroughly after using soap.
If your lower abdomen itches, this could be a sign of a yeast infection. But itching is not always the same as fungus. Ask a gynaecologist or midwife to be really sure it's a yeast infection you have. There are also self-tests available for purchase. If you have a yeast infection, it's important to treat it. If you are having problems or experiencing discomfort, it is important that you get the right help.
If it turns out to be a yeast infection, you can still use a menstrual cup. If it is completely clean when you insert it, there is no reason why the cup should make the infection worse.
Some people find that the small spike at the bottom of the cup rubs against the lining of the vagina. This should not be the case. In this case, try cutting the spike slightly, or simply changing the cup and trying a different shape. If you have a yeast infection and it's already irritated, a cup that chafes won't feel any better. If you have an ongoing yeast infection and you feel the cup irritating your vagina, you can take a break until the infection heals.
The shape of the cup can put more stress on the mucous membranes. If you notice itching after the last few days of your period, try a cup of a different shape or size. It shouldn't itch and it shouldn't feel uncomfortable.
Problems with yeast infections can be caused by several things. Basically, it's when the balance in the vagina is disturbed for various reasons. Soap scum, antibiotics, hormone levels in the body or a low immune system or something else can contribute to the development of a yeast infection. There are tests you can take yourself to find out if your symptoms are due to a yeast infection. Don't hesitate to consult a gynaecologist or midwife for advice and treatment if you are experiencing symptoms.
You don't have to worry about the menstrual cup itself causing yeast infections. But if you are sensitive and you know that you easily get problems with yeast infections and have to use a menstrual cup, hygiene is more important than ever. Be sure to keep the cup clean and rinse it thoroughly to remove any soap residue before inserting it.
If you use lubricant when inserting the cup, this can also affect the lining of the vagina and there is a small risk of bringing in bacteria. Be sure to always wash your hands before handling both the cup and the lubricant.