When to worry about palpitations with dehydration

Palpitations is a common presentation of Dehydration. Losing fluid can reduce circulating volume, prompting the heart to beat faster to maintain blood flow. Dry mouth, dark urine, dizziness when standing, headache, vomiting or diarrhoea may occur alongside the sensation.

Palpitations can have other causes, so improvement with fluids does not establish a diagnosis. Heat exposure, fever, heavy sweating and medicines that increase fluid loss are useful details to share with a clinician.

Stop activity and rest in a cool place. If you are alert and able to swallow, take frequent small sips of water or an oral rehydration drink, especially after vomiting or diarrhoea. Avoid alcohol and strenuous exercise while recovering. Do not force fluids if you are confused, repeatedly vomiting or have been told to restrict fluids for a heart or kidney condition.

Get emergency help for collapse, confusion, severe drowsiness, chest pain, severe breathlessness, a seizure or inability to keep fluids down. Seek same-day medical advice for persistent dizziness, very little urine, worsening weakness, ongoing vomiting or diarrhoea, or palpitations that do not settle after rest and appropriate fluids.

Ask how much and what type of fluid is appropriate for you, whether any medicine may be worsening fluid loss, and which symptoms mean you should attend an emergency department. Discuss whether blood tests or an electrocardiogram are needed if episodes recur.