Yes, stomach bleeding can happen without noticeable pain
On the cellular level, central sensitization alters the neurons that sense pain via increases in membrane excitability, stronger synaptic strength, and the diminished ability to inhibit transmission of sensation
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In the thirties, elixir sulfanilamide, an antibiotic mixed into a toxic solvent, gave patients intense pain, kidney failure, and neurological problems
It demonstrates notable stability in human gastric juice and systemic activity across multiple administration routes