Great news, yes you can use a V-CUPS menstrual cup if you have endometriosis. We do recommend that you consult with your physician or gynecologist before purchasing to make sure it is suitable for you and your body. We find that many V-CUP users living with endometriosis find menstrual cups to be a great period care product due to their ability to hold more fluid, which results in less trips to the bathroom. Since V-CUPS collects your flow as opposed to absorbing it, this can be a helpful tool in measuring your blood loss as well. This information in useful to share with your gynecologist to monitor your endometriosis.