irritate
     v 1: cause annoyance in; disturb, especially by minor
          irritations; "Mosquitoes buzzing in my ear really
          bothers me"; "It irritates me that she never closes the
          door after she leaves" [syn: {annoy}, {rag}, {get to}, {bother},
           {get at}, {rile}, {nark}, {nettle}, {gravel}, {vex}, {chafe},
           {devil}]
     2: excite to an abnormal condition, of chafe or inflame;
        "Aspirin irritates my stomach" [ant: {soothe}]
     3: excite to some characteristic action or condition, such as
        motion, contraction, or nervous impulse, by the
        application of a stimulus; "irritate the glands of a leaf"
Source: WordNet® 2.0