Some breast cancer patients who had a mastectomy have reported feeling painful and non-painful sensations in the area of the breast that was removed. This condition, known as phantom breast syndrome (PBS), usually start in the first year after a mastectomy. Sensations due to PBS usually occur in the chest, armpit, surgical scar, and inner arm and last far beyond the expected time for post-surgical pain. The prevalence of PBS is not exactly known, most likely due to a lack of reporting as patients either feel like it is not that big of a deal or because they find it hard to describe. PBS has been reported to affect anywhere between 4% to 56% patients; other studies report that it affects anywhere between 10% to 55% of women.