Fluid retention in the lower body is sometimes linked to heart function. When the heart struggles to pump blood effectively, fluid may accumulate in the legs, ankles, or feet. This swelling, known as edema, often becomes more noticeable by the end of the day or after long periods of standing or sitting.

4. Weakness in the arms

Sudden or unexplained weakness in the arms can occur when the body is not receiving enough oxygen-rich blood. Some individuals report feeling as though their arms are unusually heavy or difficult to move. This sensation may appear during physical exertion but can also occur unexpectedly.