Extreme fatigue is one of the most defining symptoms of the flu and a major reason people often mistake influenza for “just being run down” at first. Unlike a mild cold, the flu can cause sudden, overwhelming exhaustion that interferes with daily life. Many patients describe flu-related fatigue as feeling “hit by a truck,” even before other symptoms fully develop. Understanding why the flu causes such intense tiredness, and when that fatigue may signal a ...
Feeling shaky or jittery when you’re sick can be uncomfortable and even alarming. Some people describe it as trembling, internal shaking, weakness, or feeling “on edge” without knowing why. While this symptom can be unsettling, it is actually a common response to illness, especially during infections like the flu, colds, or other viral conditions. Understanding why shaking happens and when it becomes a concern can help you feel more at ease and know when ...
