根據塔利斯嘅講法，相思病好多症狀可以歸類去精神疾病診斷與統計手冊第四冊同ICD-10（國際疾病分類）。強迫症係相思病其中一種嘅症狀，佢仲包括神不守舍、不斷檢查自己嘅手機、Facebook、囤積一啲冇價值物品。意大利精神科醫生Donatella Marazitti做過嘅另一項研究發現，當人墜入愛河嗰陣，佢咃嘅血清素水平會趺到強迫症患者嘅水平，而呢種水平明顯低過健康人嘅水平。
According to Tallis, many of the symptoms of lovesickness can be classified by the Diagnostic and Statistical Manual of Psychiatric Disorders Book IV and the ICD-10 (International Classification of Diseases). Obsessive-compulsive disorder is one of the symptoms of lovesickness, which also includes being distracted, constantly checking one's phone, Facebook, and hoarding little things of value. Another study done by Italy psychiatrist Donatella Marazitti found that when a person falls in love, his serotonin levels can be traced back to those of people with obsessive-compulsive disorder, which are significantly lower than those of healthy people.