How do you diagnose PID?

Dr Sarah Jarvis MBE

Symptoms may develop quickly. You can become quite ill over a few days. Sometimes symptoms are mild and develop slowly. For example, you may just have a mild abdominal pain that may 'grumble on' for weeks. In some cases no symptoms develop and you do not know that you are infected. However, you are still at risk of complications even if you have no symptoms at first.

https://patient.info/health/pelvic-pain-in-women/pelvic-inflammatory-disease#nav-1