When potassium levels in the blood are high, it is referred to as hyperkalemia. High potassium levels can be caused by various factors, including kidney problems, certain medications, excessive potassium intake, or hormonal imbalances. Hyperkalemia can disrupt the electrical signals in the heart, leading to abnormal heart rhythms or palpitations. It can also cause muscle weakness, fatigue, numbness or tingling, nausea, and in severe cases, paralysis or cardiac arrest. If you suspect high potassium levels or experience concerning symptoms, it's essential to seek immediate medical attention for proper evaluation and treatment.