Scratching feels amazing because, for a brief moment, it can trick our bodies into forgetting that we are itchy. Scratching your nails across your skin causes a minor pain sensation that temporarily distracts your brain. The problem is, whilst short term it feels good, long term, it causes more problems. Scientists now say scratching causes your system to release serotonin, which helps control pain but also, increases itchiness (it’s a vicious cycle!).