Which spider's bite is immediately painful?

The black widow spider is known for its immediately painful bite due to the presence of a potent neurotoxin in its venom. When bitten, individuals often experience acute pain that can be accompanied by other systemic symptoms such as muscle cramps, nausea, and sweating. This immediate reaction sets the black widow apart from other spiders.

The brown recluse's bite may take hours to develop into a more serious condition characterized by necrosis and is less acutely painful at the outset. Jumping spiders and tarantulas, while capable of causing discomfort, do not typically produce the same level of immediate pain and systemic effects attributed to the black widow's bite. This makes the black widow's bite distinctly notable for its prompt and severe reaction.