頭

1. Origins, structure, and basic meaning

• Structure: 頭, read あたま, denotes the head as the body part containing the organs of thought and major senses.
• Basic usage: It names the head that feels heavy and the body part bowed slightly after removing a hat.

2. Common pitfalls and similar expressions

• Body part and bodily expression
  • 頭が重い describes discomfort rather than literal weight, while 頭を下げる describes bowing the head.