Why does coffee cause nausea, headache and sweaty palms?

Umi Nadhirah Binti Rokhibi commented on your Wall post.

Umi Nadhirah wrote "bila minum satu sachet kopi (Nescafe,Ali Cafe,etc.),tiba-tiba jadi pening,nausea,tapak tgn berpeluh,kenapa ya?"

Faridah Abdul Rashid: nausea - as coffee is bitter and does initiate nausea; sounds more like onset/aura of migraine; maybe nervousness or stress response.