Could left arm swelling be an indicator of heart failure?

Heart failure can lead to fluid retention in the body, which often causes swelling (edema). This usually affects the lower extremities first, but in some cases, the arms—especially if both are swollen—can also be involved. Swelling from heart failure is typically:

Bilateral (affecting both sides) Accompanied by other symptoms such as shortness of breath, fatigue, or rapid weight gain Worse at the end of the day Swelling in only the left arm is less commonly linked to heart failure and may instead point to:

A localized issue, such as a blood clot, infection, injury, or lymphedema A complication after surgery or cancer treatment, especially involving the lymph nodes

If arm swelling is new, persistent, or accompanied by chest pain, difficulty breathing, or other concerning symptoms, seek medical evaluation to determine the cause.