pain

1. Origins, structure, and basic meaning

• Structure: 痛 has 12 strokes and concerns pain or feeling something keenly.
• Basic usage: 痛い is read いたい, and 痛感 is read つうかん.

2. Common pitfalls and similar expressions

• Pain and a keen realization
  • 少し痛い means it hurts a little.
  • The 痛 in 痛感 is read つう.
  • 家族のありがたさを痛感した means keenly appreciated one's family. This use does not describe physical pain.