On the fourth day after egg retrieval, bicycling is permitted if there are no symptoms of ovarian hyperstimulation, and is not recommended if symptoms of ovarian hyperstimulation have developed. Four days after egg retrieval the normal body has returned to its preoperative state and riding a tram will not have a detrimental effect. However, if ovarian hyperstimulation syndrome occurs after the procedure due to the removal of too many eggs during the procedure, riding a motorized bicycle is not recommended. In mild cases, ovarian hyperstimulation syndrome may be asymptomatic or manifest only as nausea, vomiting, abdominal distension, diarrhea, etc. In severe cases, it may result in chest and abdominal fluid, liver and kidney damage, and severe respiratory distress. Ovarian hyperstimulation syndrome should be avoided by avoiding exercise, such as cycling, climbing stairs, running, and requires prompt medical treatment, which should be carried out under the guidance of a doctor.