What symptom is often experienced in both CHF and pulmonary hypertension?

Fatigue is commonly experienced in both congestive heart failure (CHF) and pulmonary hypertension due to the underlying physiological changes occurring in these conditions. In CHF, the heart's reduced ability to pump blood effectively leads to inadequate blood flow to the muscles and organs, which can result in feelings of tiredness and decreased exercise tolerance. Similarly, in pulmonary hypertension, the increased pressure in the pulmonary arteries makes it more difficult for the heart to pump blood through the lungs, leading to diminished oxygen delivery to the body. As a result, patients may experience profound fatigue due to the combined effects of reduced cardiac output and lower oxygen levels.

The other options relate to symptoms that are less common between these two conditions. Chest tightness can occur in various cardiovascular and respiratory conditions but isn't a hallmark symptom of either CHF or pulmonary hypertension. Fever is typically associated with infections or inflammatory processes rather than these specific cardiovascular disorders. Diarrhea is not a common symptom associated with either condition and is more linked to gastrointestinal issues.