Can ovarian cancer cause positive pregnancy test?

Ovarian Cancer: Many different types of cancer comprise what is commonly called "ovarian cancer." Many of these can induce secondary changes in the surrounding ovarian tissue to secrete hormones that may in part mimic pregnancy effect. Only a few uncommon types will actually produce pregnancy hormones themselves.

Common vs. rare: At 27 years of age, ovarian cancer is very rare. The more common cause of a positive pregnancy test is pregnancy itself. Sometimes a pregnancy can implant on an ovary (ectopic pregnancy). If an ultrasound does not show a pregnancy, it is worth a look at the ovaries. Ovaries are the source of egg cells, and a growth there could theoretically cause an elevation in HCG (pregnancy hormone).