Heart failure

A long-term condition where the heart does not pump or fill as well as it should.

Also known as: congestive heart failure, CHF

Medically reviewed by Site Owner Last reviewed 28 October 2026

What is heart failure?

Heart failure means the heart is not pumping or filling as well as it should to meet the body’s needs. It does not mean the heart has stopped. It is a long-term condition that can often be managed well with treatment.

Symptoms

  • Breathlessness on activity, lying flat or waking at night

  • Swelling of the ankles, legs or abdomen

  • Tiredness and reduced exercise ability

  • Rapid weight gain from fluid retention

Common causes

  • Coronary artery disease and previous heart attack

  • Long-standing high blood pressure

  • Heart valve disease

  • Cardiomyopathy

  • Irregular heart rhythms such as atrial fibrillation

Diagnosis

Tests may include blood tests (including natriuretic peptides), ECG, chest X-ray and echocardiography to measure how well the heart pumps (ejection fraction).

Treatment

Treatment depends on the type of heart failure and usually combines guideline-directed medicines, fluid and salt advice, management of the underlying cause, devices in selected patients, and cardiac rehabilitation. Daily weight checks help detect fluid build-up early.

Sources and references

  1. NHS – Heart failure — NHS
  2. American Heart Association – Heart failure — AHA
  3. Heidenreich PA, et al. 2022 AHA/ACC/HFSA Guideline for the management of heart failure. Circulation 2022 — AHA/ACC/HFSA

Information on this website is educational and does not replace a consultation with a qualified doctor. Treatment suitability is decided only after clinical assessment.