Amenorrhea can lead to weight loss but it can also cause weight gain. The impact on weight varies depending on the cause of amenorrhea. If a woman experiences amenorrhea due to consistent dieting and weight loss, it can lead to a physiological disorder of the hypothalamic-pituitary axis, resulting in what is known as psychogenic amenorrhea. This type of amenorrhea usually results in significant weight loss in women. On the other hand, if a woman's amenorrhea is caused by polycystic ovary syndrome, it does not lead to weight loss and can even cause significant weight gain. Amenorrhea caused by this condition generally requires treatment with medication and interventions such as exercise before symptoms can improve significantly. Therefore, the treatment for amenorrhea should be based on its specific causes, as different causes can have different effects on weight.