The phrase "to accompany the symptoms" means that something else is happening or coming along with the symptoms, often at the same time. Full definition
Specialist medical care could involve prescriptions or advice regarding medication to treat accompanying symptoms such as insomnia, pain or depressive illness. (sciencedaily.com)
A high fever often accompanies these symptoms as well. (puppys-place.com)
Other accompanying symptoms include: frequent bowel movements with a sense of urgency. (pethelpful.com)