A condition of hypersensitivity to particular substances or stimuli; in medicine it can refer to allergic or excessive immune reactions.
彼は花粉による過敏症で春は辛いと言っている。
He says spring is hard because of his pollen hypersensitivity.
医師は患者に過敏症の検査を勧めた。
The doctor recommended tests for hypersensitivity to the patient.
ハチ毒に対する過敏症がある人は特に注意が必要だ。
People who have hypersensitivity to bee venom need to be especially careful.