Heart failure manifests through a range of symptoms primarily due to fluid accumulation in the body and reduced cardiac output. Key indicators often include:

Fluid Retention Symptoms:
* Swelling (edema) in the legs, ankles, and feet.
* Weight gain due to fluid buildup.
* Abdominal bloating (ascites).
* Increased frequency of urination, especially at night.

Respiratory Symptoms:
* Shortness of breath (dyspnea), which may occur during activity, at rest, or worsen when lying down.
* Cough, sometimes accompanied by white, pink, or even blood-tinged sputum.

General Symptoms of Reduced Cardiac Output:
* Fatigue and easy fatigability.
* Weakness.
* Dizziness or lightheadedness.
* Heart palpitations or irregular heartbeat.
* Loss of appetite (anorexia).
* Nausea and vomiting.
* Chest pain (though this can be a symptom of various heart conditions).

These symptoms can develop gradually or appear suddenly, and their severity can vary. Prompt medical evaluation is crucial if any of these symptoms are experienced.