What diseases can cause bad breath?

The problem of bad breath is a very easy problem to face in life. Sometimes it is caused by gastrointestinal diseases. Some respiratory diseases can also cause bad breath. Tonsillitis and sinusitis may also be the cause.

1. Gastrointestinal diseases - fecal odor, sour odor, bad breath

Patients with gastric disease will produce a sour and rotten odor because food stays in the stomach for too long, which is emitted through the mouth. At the same time, gastric diseases such as flu-like esophagitis can also cause pathological bad breath, and vomitus adhering to the mouth and throat will continuously release "sour gas". Patients with severe constipation and intestinal obstruction often have a fecal odor.

2. Liver failure – foul smelling excrement

Patients with liver failure have weakened liver metabolism and reduced ability to break down toxins, which will lead to elevated blood ammonia levels, causing slightly sweet excrement odor in the patient's mouth. At the same time, the weakened metabolic capacity of certain branched-chain amino acids in the body can also cause a rotten apple smell.

3. Respiratory diseases – foul smell and bad breath

For example, pulmonary suppuration and putrefactive tracheitis often cause putrid and foul breath; hemoptysis due to tuberculosis and bronchiectasis often cause bloody bad breath; upper respiratory tract diseases such as sinusitis, tonsillitis and pharyngitis often cause putrid smell.

4. Diabetic pyruvic acidosis - rotten apple smell

Diabetic patients may have a rotten apple or ketone smell in their mouths. This is because the patient's blood sugar is above the standard and cannot be controlled in time. The fat in the body breaks down to produce ketone bodies, among which the α-ketoglutaric acid emits a sour rotten apple smell.

5. Uremia – foul smell of urine

Patients with uremia generally mean that their condition has developed to the stage of chronic renal failure. Since they cannot urinate, some toxins in the body cannot be excreted through urine and are retained and accumulated in the blood, causing the patient's exhaled gas to emit a urine smell.