What is the cause of my abdominal pain - is it pelvic inflammatory disease or an ovarian cyst? How is it treated?

Patient's question:

Assisted examination: Ultrasound　　BV: Negative
On October 22, the child had a natural miscarriage before turning one month old. The pregnancy was accompanied by left-sided pain, which was later diagnosed as pelvic inflammatory disease (PID) at the hospital (no ultrasound performed). After taking traditional Chinese medicine and medication for a month, a follow-up visit revealed that it was not PID but instead adnexitis with moderate cervical erosion. An ultrasound showed a left ovarian cyst, with the following specific data:
Uterus:
1. Size: Length 5.3 cm, Width 4.8 cm, Thickness 4.2 cm
2. Contour: Regular
3. Echo: Intrauterine fetal echo

Doctor's answer:

??????Hello, because pelvic inflammatory disease not only affects physical health but also causes various other impacts. Pelvic inflammatory disease can manifest as lower abdominal heaviness, distension, and pain, as well as lower back and sacral soreness. Pelvic inflammatory disease often recurs and persists for a long time. The harm of pelvic inflammatory disease can lead to adverse emotions such as anxiety, irritability, and depression in patients, as well as secondary sexual indifference and aversion, affecting intimate relationships. Actively seek treatment and take traditional Chinese medicine, such as Gynecological Qianjin Tablets (capsules). Generally, it takes 3–4 courses of treatment, with 2–3 courses for those with milder conditions, with each course lasting 14 days. It can reduce inflammation and enhance the body's immune function. Regular check-ups are recommended, along with attention to nutrition, to alleviate concerns, boost treatment confidence, and improve nutrition and physical exercise.