Ovarian hyperstimulation syndrome (OHSS) is a common complication of ovulation promotion and requires prompt medical attention if abnormal symptoms worsen, or hospitalization in severe cases. Here are some tips on how to self-monitor ovarian stimulation and screen for OHSS. Self-monitoring of ovarian hyperstimulation syndrome (OHSS) refers to the simultaneous growth of multiple follicles and high estrogen levels during ovulation promotion treatment, which stimulates a series of reactions in the body to secrete a large amount of cytokines, causing an increase in capillary permeability, just like a larger sieve in a screen, which can lead to water leaking outward from the blood vessels and into the abdominal cavity, resulting in ascites and, in severe cases, pleural fluid. Patients feel bloated and nauseous, and in severe cases, they can barely eat, have difficulty breathing and cannot lie down, and their urine output is significantly reduced. The loss of water in the blood vessels causes the blood cells to become concentrated, which can easily lead to the formation of blood clots. In case of pregnancy, the symptoms of OHSS will be aggravated or delayed by the stimulation of HCG secreted in the body, sometimes not relieved until after the second month of pregnancy. How to monitor ovarian hyperstimulation syndrome 1. Proper measurement of weight and abdominal circumference Daily measurement of weight and abdominal circumference is a simple and effective way to assess the condition of OHSS. To ensure the accuracy of the measurement results and to avoid the influence of clothing, eating and body position on the results, it is recommended to wear the same clothes and measure the weight after defecation every morning without eating; lie flat on the bed and make a circle around the belly button to measure the abdominal circumference, and make a record and draw a curve of weight and abdominal circumference changes to provide a basis for subsequent observation and treatment. 2.Accurate recording of 24-hour intake and output Record how much you have eaten, drunk and defecated during the whole day, which is also very effective for assessing the condition of OHSS. By recording the 24-hour intake and output, you can understand the balance of water in your body and assess the progress and regression of OHSS. 3.Choose the correct diet Due to the increase of systemic capillary permeability, protein loss increases in OHSS patients, and the protein level in blood circulation will be significantly lower than normal, and the too low blood protein level will further aggravate the formation of ascites and pleural fluid, causing a vicious circle. Therefore, for patients with low protein level, the diet encourages high protein diet, such as eating some beef, shrimp, milk and other protein-rich food; for patients with obvious abdominal distension and loss of appetite, the diet encourages eating less and more meals and eating easily digestible food. 4.Choose appropriate rest For patients with obvious abdominal distension, or poor breathing, the head of the bed can be properly elevated about 15-30°, and small flow of oxygen inhalation can be given if necessary, which is conducive to the activity of respiratory muscles and relieves the effect of fluid accumulation in the abdominal cavity on the thoracic volume. In patients with significantly enlarged ovaries, avoid sudden changes in position to trigger ovarian tip torsion. In patients with suspected hemoconcentration of OHSS, appropriate activities should be performed and both lower extremities should be massaged regularly to avoid thrombosis of the lower extremities.