頭痛

1. Origins, structure, and basic meaning

• Structure: 頭痛 is a noun read ずつう, meaning a headache.
• Basic usage: It can explain why plans changed or identify when a symptom began during a medical examination.
  • 朝から頭痛が続いたので、予定を変更しました。 says that the schedule was changed because a headache had continued since morning; 診察の際に頭痛が始まった時刻を伝えました。 describes telling the doctor when the headache began during the examination.

2. Common pitfalls and similar expressions

• 頭痛が続いたので
  • ので presents the continuing headache as the reason for changing the schedule.
• 始まった時刻
  • The past form modifies time and identifies the point when the headache began.
• 頭痛 and 腹痛
  • 頭痛 is pain in the head, while 腹痛 is abdominal pain.