<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, I have been experiencing weight gain, long menstrual periods, nosebleeds, and nausea. What could be the problem?  <response>: Based on your symptoms, you could be suffering from a pituitary adenoma. This is a tumor that develops in the pituitary gland, which can cause hormonal imbalances leading to symptoms such as weight gain, menstrual irregularities, nosebleeds and nausea. 