相思病唔單止係一種詞語上嘅表達，仲有研究指佢係一種實際上嘅疾病。1915年時，西格蒙德·弗洛伊德曾經提出：“我咃仲未明白墜入愛河係咩意思，但可以肯定佢係一種疾病同埋瘋狂、一種幻覺，係對所愛之人嘅盲目性”。
Lovesickness is not only a verbal expression, but there are studies that point to it as an actual disease. In 1915, Sigmund · Freud once proposed: "I don't understand what it means to fall in love, but it is certain that he is a disease and madness, an illusion, a blind uranium to a loved one."