Why could a high level of prolactin indicate a tumour?

I'm 39 and for the last year my periods have become more erratic, I've had none at all for the last three months.

- DR ROSEMARY LEONARD

I thought I was having an early menopause even though I've had no other symptoms, but the blood tests my GP arranged have shown I have a high prolactin level. She mentioned I might have a small tumour in my brain, which sounds alarming, though she didn't seem too concerned. She's arranged for me to have an MRI but that isn't for another two months which seems a long time to wait.Prolactin is a hormone produced by the pituitary gland, a small pea-sized structure in the base of the brain. Its main function is to stimulate milk production after childbirt