Ovarian cyst 9 cm is more serious. Ovarian cyst 9 cm can produce compression symptoms if it is a benign tumor, leading to symptoms such as frequent urination and difficulty in defecation, and can compress the fallopian tubes to cause infertility and so on. When ovarian cysts are large, they can have complications such as torsion of the tip, rupture, infection, malignant transformation, etc. They can cause acute abdominal diseases such as intra-abdominal hemorrhage, which require emergency surgical treatment and have more serious consequences. When the ovarian cyst 9cm is malignant tumor, it can cause abdominal distension, abdominal fluid accumulation, anemia, irregular vaginal bleeding and other symptoms, and the tumor cells can cause tumors in other parts of the organism along the pathways of lymphatic metastasis, hematogenous metastasis, direct spread and so on. Ovarian malignant tumors are prone to recurrence and poor prognosis, which obviously threaten women’s health and life safety with serious consequences. Ovarian cysts 9 cm, it is recommended that patients consult a regular hospital in a timely manner, under the guidance of a professional doctor to give reasonable treatment.