Patients with chronic renal failure, also known as uremia, may experience a urine or fishy smell in their mouth. This is because toxic substances in the body cannot be excreted and remain in the blood, being released through breathing or urination.
Patients with severe liver disease, especially those with hepatic encephalopathy, may emit a distinctive odor in their mouth or urine, similar to a combination of rotten apples, rotten eggs, and garlic. This liver odor is a specific symptom of liver failure, possibly caused by the accumulation of dimethyl sulfide and methyl mercaptan in the body after the excessive methionine is digested and acted upon by bacteria.
Normal people pass gas 5-10 times a day. The smell of gas is mainly determined by hydrogen sulfide produced by bacteria after processing food. If the gas has a particularly foul smell, it may indicate a bacterial infection in the intestines or damage to the intestinal mucosa by bacterial toxins. Additionally, intestinal tumors can cause blood to accumulate in the intestines, and the blood decomposed by stomach acid and intestinal bacteria can make the stool tar-like, and the gas emitted particularly foul.
Vaginal discharge is a milky or clear fluid secreted by the female vagina. Foul-smelling vaginal discharge usually indicates a severe infection or tumor in the reproductive tract. It can be a signal of trichomonal vaginitis, gonorrhea, cervical cancer, or endometrial cancer. Especially in older women, foul-smelling and brightly colored vaginal discharge may be a sign of a malignant tumor.