痛感

1. Origins, structure, and basic meaning

• Structure: 痛感, read つうかん, means feeling or realizing something deeply and keenly.
• Basic usage: It can describe both a painful realization that one was unprepared and a deep appreciation of one's family.

2. Common pitfalls and similar expressions

• A keener feeling than 実感
  • 実感する focuses on vividly feeling that something is real through experience. 痛感する gives greater emphasis to how deeply and keenly that fact strikes a person.