I reviewed the claim that drinking too much water can be just as bad or worse than dehydration and can cause symptoms like headaches, nausea, vomiting, muscle cramps, brain fog, and sodium imbalance. Medical sources confirm that drinking excessive amounts of water can be harmful in rare cases and can lead to a condition called hyponatremia, where sodium levels in the blood become too diluted. This can cause symptoms such as headache, nausea, vomiting, confusion, muscle cramps, and fatigue. However, reliable health sources also explain that this condition is uncommon in healthy people and usually only occurs when very large amounts of water are consumed in a short period of time or in specific medical or endurance situations. The kidneys normally regulate water and sodium balance effectively in most people. Overall, the claim is partially accurate because it correctly identifies possible effects of overhydration, but it is overstated in suggesting that drinking too much water is commonly just as dangerous as dehydration.