article_snippet: That is according to a new study by a group of scientists at University College London.
article_snippet: Scientists monitored the patients' health over the next 46 months.
article_snippet: This study was published in Psychosomatic Medicine.
article_snippet: The symptoms of these two types are similar, but there are some important differences.
article_snippet: In some cases, the pain can also develop after eating a meal or during cold weather.
article_snippet: Source: NHS Choices .