快感

1. Origins, structure, and basic meaning

• Structure: 快感 (かいかん) is a strong pleasurable sensation from achievement or bodily experience. Both use 覚える.
• Basic usage: Solving a hard problem brings a thrill; running through cold wind brings sensory pleasure.

2. Common pitfalls and similar expressions

• Achievement thrill and physical rush
  • The form is the same, but causes are 解けた瞬間 and 走る. Distinguish psychological and bodily sources.