Complication of taking fertility drugs resulting in gross enlargement of the ovaries. In other words, hyperstimulation occurs when the ovaries produce excess eggs in response to stimulation by fertility drugs. This complication can be accompanied by an accumulation of fluid in the abdomen and lungs, and abnormal blood tests. However, hyperstimulation occurs in this severe form, requiring medical intervention, less then 1% of the time. Additionally, we monitor the body's response to fertility drugs, which allows us to see which patients are at risk in order to take the proper steps to prevent any problems from occurring.