The short answer is yes, death by lava is incredibly painful.
Lava is molten rock with temperatures reaching up to 2,200 degrees Fahrenheit (1,200 degrees Celsius). When exposed to lava, the human body would immediately experience severe burns, charring, and tissue destruction.
The intense heat would cause excruciating pain, and the body would likely be engulfed in flames. Death would occur rapidly due to the extreme burns and shock.
While the exact experience is difficult to describe, it's safe to say that death by lava would be a horrific and agonizing event.