High potassium levels, also known as hyperkalemia, can have various effects on the body. Excess potassium 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. Hyperkalemia requires medical attention, as it can be life-threatening. Treatment may involve addressing the underlying cause, managing potassium intake, administering medications, or employing other interventions to lower potassium levels.