"We all experience the ups and downs of life sometimes. We might be treated badly by others or miss out on something we think we deserve, like a promotion at work. This can make us feel wronged, but we often get over it – or so you might think. In recent years, researchers have shown that carrying a sense of injustice or unfairness about something, particularly over a prolonged period, can have an adverse effect on our health. In particular, it can make painful conditions worse."