Can dehydration cause muscle cramps? What science really says

             Written by: Dr Subita Alagh

21 July 2025

Sudden painful cramps during exercise or sleep? Dehydration might be the hidden culprit. Learn how fluid and electrolyte loss affects your muscles, and how to prevent it.

Photo Credit: Freepik

Painful, involuntary tightening of muscles. Usually temporary, often relieved by stretching.

What Is a Muscle Cramp?

Photo Credit: Freepik

Hot weather and excessive sweating can lead to loss of fluids and salts.This can cause an imbalance in electrolytes, which may trigger muscle spasms.

How Dehydration Causes Cramps?

Photo Credit: Freepik

- Muscle fatigue - Poor conditioning - Spinal reflex imbalances - Muscle damage (as seen in marathoners)

Other Causes of Cramps

Photo Credit: Freepik

- Stop activity - Stretch and massage - Rehydrate by adding electrolytes (milk, bananas, ORS)

How to Manage Dehydration Cramps?

Photo Credit: Freepik

Risk is higher in: - Children & older adults - Endurance athletes - People taking certain meds (diuretics, statins)

Risk Factors

Photo Credit: Freepik

If cramps are: - Severe or frequent - Not helped by home care - May signal thyroid, nerve, or circulation issues

When to See a Doctor

Photo Credit: Freepik