What should you know about muscle dehydration?

Sweating, vomiting, diarrhoea, fever, or simply drinking too little can reduce body fluid. Muscles may then feel tight, tired, weak, or prone to cramping, especially during heat or exercise. Thirst, a dry mouth, dizziness, and dark urine can support dehydration as an explanation, although dark or cloudy urine can also have other causes.

Move to a cool place, rest, and take frequent small sips of water. If fluid loss followed heavy sweating or illness, an oral rehydration solution may help replace salts; follow its instructions. Resume activity gradually and use regular drinks during prolonged heat exposure. Avoid relying on alcohol, and do not force large amounts of fluid quickly. People with kidney or heart problems should ask about a suitable fluid plan.

Seek urgent care for confusion, fainting, inability to keep fluids down, severe weakness, very little urine, or signs of heat illness. Arrange review if symptoms persist despite drinking or follow repeated vomiting or diarrhoea. A clinician may look for Gastroenteritis, Heat Exhaustion, a urinary problem, or another reason for fluid loss.

Ask how much and what type of fluid is appropriate for you, whether medicines affect hydration, and whether ongoing urinary or bowel symptoms need assessment. Mention recent heat exposure, illness, and urine changes.