Hiccups that smell like death may be caused by dietary factors, indigestion, and infection with Helicobacter pylori. 1. Dietary factors: due to eating too much onion, garlic, leeks and other foods with irritating odor, it may lead to odor when burping. This is usually temporary and can disappear on its own. 2. Indigestion: As a result of eating spicy and stimulating foods that are not easy to digest, the burden on the stomach and intestines is increased and the food cannot be digested in time. After fermentation, a large amount of foul-smelling gas can be produced, which can lead to the bad smell of burping. 3. Infection of Helicobacter pylori: Due to the infection of Helicobacter pylori, the bacteria may multiply in the patient’s digestive tract, affecting the normal gastric function, which may lead to burping with odor, bad breath, acid reflux and other symptoms. If the smell of burping is like dead smell, it may also be pyloric obstruction, etc. If the symptoms are not relieved, it is recommended that the patient go to the hospital in time to clarify the cause of the disease and follow the doctor’s instructions for standardized treatment.