悪寒|おかんokan[0]heiban (flat)

1. nounchill; shakes; ague

• Synonym寒気さむけNeutralThe everyday word for feeling cold, as in 「寒気がする」; 「悪寒」 is the more formal, medical term for chills.
• Related身震いみぶるいNeutralA shiver: suddenly shaking all over, usually from fear or cold rather than fever.
• Related震えふるえNeutralTrembling of the body from any cause — not limited to cold; fear or nervousness can also bring it on.

For everyday feelings of cold use 「寒気」; 「悪寒」 is the medical, formal word for fever chills, as in 「悪寒がする」. Use 「震え」 for trembling from any cause, and 「身震い」 for a sudden shiver from fear or cold.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 発熱はつねつなどにより起おこる寒さむい感かんじ。