Hilda Hutcherson, MD, assistant professor of obstetrics and gynecology at Columbia University Medical Center, says that herpes outbreaks may increase during the menstrual cycle, but it varies by person. These outbreaks are thought to be secondary to hormonal changes, she explains.

Why do I get a herpes outbreak when I get my period?

However, some women find that they are more likely to experience a herpes outbreak during their period. It is thought that changes in your hormone balance during your period may make it easier for the virus to cause symptoms during this time.

Why do I get sores during my period?

Due to the hormonal changes (particularly the increase in progesterone) that occur during the menstrual cycle, some women experience oral changes that can include bright red swollen gums, swollen salivary glands, development of canker sores, or bleeding gums.