Eating something spicy after a rabies vaccination is not thought to have any effect on the effectiveness of the rabies vaccine. The neutralizing antibodies produced by the rabies vaccine do not decrease or increase as a result of eating spicy foods, and there is no effect on the duration of the rabies vaccine. Some people may experience adverse reactions after the rabies vaccine, which may manifest as a loss of appetite or nausea, and eating spicier chili may aggravate these symptoms. For example, if you have acid reflux or stomach pain after eating chili peppers, this indicates that the secretion of stomach acid has increased, or the mucous membrane of the digestive tract has been damaged in some way, and ulcers may appear in serious cases. At this time, you can take appropriate proton pump inhibitors such as omeprazole, or gastric mucosa protectors such as bismuth pectin for symptomatic treatment. If there is no discomfort, there is absolutely nothing to worry about.