Follicular cysts correspond to different disease names depending on the location of the lesion in the body, and are commonly seen in the thyroid and ovarian follicular cysts. The main causes of thyroid follicular cysts are diet, environment, genetics and thyroid-related hormone disorders. If the thyroid cyst is small, the clinical symptoms are not obvious. However, as the cyst grows larger, it will be accompanied by symptoms of pressure and may also present with symptoms such as hoarseness, drinking and coughing, and difficulty in breathing. Diagnosis can be made by physical examination, color Doppler ultrasound of the thyroid gland or CT of the thyroid gland, and thyroid hormone measurement. For smaller thyroid follicular cysts, regular review is all that is needed, while for large follicular cysts with pressure symptoms or those that suddenly increase in size within a short period of time, surgery is required. Follicular cysts are a common benign occupational disease of the ovary in women who are sexually active and in their reproductive years. Follicular cysts are formed when the epithelium of the female follicle degenerates, the connective tissue of the follicle wall thickens, the oocytes die, and the follicular fluid is not absorbed or increases. They are usually asymptomatic and can be detected during ultrasound or surgery. In larger follicular cysts or in cases of torsion of the tip, this may lead to adverse consequences such as tubal blockage and ovarian necrosis, with the patient showing signs of abdominal distention or pain. When the cysts are not large, no special treatment is usually needed and they can be absorbed and recede naturally after 4-6 weeks. Ovarian cyst debridement is feasible for those with significant symptoms. When the cyst ruptures or twists causing acute abdomen, one side of the adnexa can be treated by resection.