The term 'THEY MIGHT CAUSE JITTERS' can be summarized by the crossword solution FEARS. Fears are a common emotion that is experienced when one is anxious or scared about something. They can be caused by a variety of things, such as a fear of the unknown, a fear of failure, or a fear of the future. Fears can also be caused by external factors, such as a fear of heights or a fear of spiders. In any case, fears can cause jitters, which is an uncomfortable feeling of nervousness and anxiety.