High potassium levels, also known as hyperkalemia, can present various warning signs and symptoms. These may include muscle weakness or paralysis, abnormal heart rhythms, palpitations, chest pain, shortness of breath, nausea, vomiting, tingling or numbness, and in severe cases, cardiac arrest. However, it's important to note that symptoms can vary depending on the severity and underlying cause of hyperkalemia. If you suspect high potassium levels or experience concerning symptoms, it's essential to seek immediate medical attention.