< Topic > The uncommonness which originates in the anti- cancer medicine painfully prevention of the symptom and/or offer the medicine which is effective to remedy.Solutions The uncommonness which originates in the anti- cancer medicine which contains natural type karushitonin or the karushitonin derivative as the active ingredient painfully prevention of the symptom and/or the remedy medicine is offered. In addition, prescribing natural type karushitonin or the karushitonin derivative, the uncommonness which originates in the anti- cancer medicine painfully prevention and/or the uncommonness which originates in method, and the anti- cancer medicine which it remedies painfully prevention of the symptom and/or also natural type karushitonin in order to produce the remedy medicine or use of the karushitonin derivative is intended the symptom.< Selective figure >It is not【課題】抗癌剤に起因する異痛症の予防及び/又は治療に有効な医薬を提供すること。【解決手段】天然型カルシトニン又はカルシトニン誘導体を有効成分として含有する抗癌剤に起因する異痛症の予防及び/又は治療剤が提供される。また、天然型カルシトニン又はカルシトニン誘導体を投与して抗癌剤に起因する異痛症を予防及び/又は治療する方法、並びに抗癌剤に起因する異痛症の予防及び/又は治療剤を製造するための天然型カルシトニン又はカルシトニン誘導体の使用も意図される。【選択図】なし