Metallic Taste in Mouth and Bad Breath
As toxins build up in the bloodstream (a condition known as uremia), they can affect your sense of taste and smell. Many people describe a “metallic” or “ammonia-like” taste in the mouth, along with persistent bad breath.
You may lose interest in eating or notice that food tastes different than usual — both early signs that your kidneys may be struggling.
Nausea and Vomiting
When waste products accumulate, they can irritate the stomach and trigger nausea or vomiting.
This symptom is often accompanied by loss of appetite and sudden, unexplained weight loss. It’s the body’s way of signaling that it’s overloaded with toxins and can’t process them efficiently.
Muscle Cramps
Electrolyte imbalances — especially low calcium or high phosphorus — are common in kidney disease.
These imbalances can cause painful muscle cramps, particularly at night or after physical activity. Regular or worsening cramps may indicate declining kidney performance.
Trouble Sleeping
Toxin buildup doesn’t just affect the body — it impacts your sleep, too.
People with kidney issues often experience insomnia, restless legs, or trouble staying asleep. In severe cases, sleep apnea may develop, worsening fatigue and heart strain.
Puffy Eyes
Swollen or puffy eyes, especially in the morning, can be an early sign of protein leakage in the urine.
This puffiness occurs because the kidneys are allowing essential proteins to escape, disrupting the body’s fluid balance. If it’s persistent, it’s worth checking kidney function.
Shortness of Breath
When fluid builds up in the lungs (a result of poor kidney filtration), breathing can become difficult.
Additionally, reduced red blood cell production (caused by kidney damage) can lower oxygen levels, leaving you short of breath even during mild activities.
High Blood Pressure
The kidneys help regulate blood pressure by controlling sodium and fluid levels. When they malfunction, blood pressure can rise sharply.
Chronic high blood pressure further damages kidney tissue — creating a dangerous cycle that can accelerate kidney failure.
