If something bad is symptomatic of something else, it is caused by the other thing and is proof that

中文解释

表明…存在的，是…的征兆的 Jealousy within a relationship is usually symptomatic of low self-esteem in one of the partners. 恋爱关系中嫉妒情绪的产生通常表明其中一方不够自信。