Medical Issues
Some health issues such as acid reflux or heartburn can also be a cause of bad breath. Also, it is often an early symptom of many underlying diseases that might not have an outward sign. For example, diabetic ketoacidosis in people with diabetes type 1 might cause fruity-smelling breath. The same is true for diabetes type 2 and chronic kidney illnesses, which might result in ammonia-like, fishy, or urine-like odors. Also, a musty, sweet, and strong smell when breathing can indicate liver disease. [7]
