When kidney function becomes severely impaired, waste products may build up in the bloodstream and affect taste.
Some people describe:
* a metallic taste
* food tasting different
* reduced enjoyment of meals
Dental problems, medications, infections, and other conditions can cause similar changes.
## 15. Bad Breath That Seems Unusual
Advanced kidney dysfunction can sometimes alter breath odor.
However, bad breath is much more commonly caused by:
* dental problems
* gum disease
* dry mouth
* sinus issues
* certain foods
It should not be used alone as a sign of kidney disease.
## 16. Loss of Appetite
People with more advanced kidney disease may lose interest in food.
Possible reasons include:
* nausea
* altered taste
* general illness
* buildup of metabolic waste
Persistent appetite loss deserves medical evaluation.
## 17. Nausea or Vomiting
Severely reduced kidney function can lead to nausea and vomiting.
These symptoms are common in many other illnesses, so they are most concerning when combined with other signs such as swelling, major changes in urination, or severe weakness.
## 18. Unexplained Weight Loss
Weight loss without trying can occur when appetite decreases or chronic illness affects nutrition.
Because unexplained weight loss has many potential causes, it should be medically assessed if it continues.
## 19. Shortness of Breath
