Which symptom may result from left side heart failure?

Left-side heart failure is characterized by the heart's inability to effectively pump blood to the body's organs, leading to a buildup of fluid in the lungs. This condition often results in shortness of breath, also known as dyspnea, especially during physical activity or when lying flat. The congestion in the lungs can make it difficult for an individual to breathe comfortably, contributing to feelings of breathlessness. This symptom is a clear indication of the heart's decreased functionality and the associated pulmonary congestion that characterizes left-side heart failure.

In contrast, symptoms like increased energy levels, increased appetite, and improved physical activity are not typically associated with left-side heart failure, as this condition generally leads to fatigue and reduced exercise tolerance due to the heart's compromised ability to circulate blood effectively.