Why am I always tired? 22 medical reasons for feeling tired

You’re not exercising enough

It might be the last thing you feel like, but avoiding exercise because you’re tired actually makes you feel worse. In a University of Georgia study, sedentary but otherwise healthy adults who began exercising lightly three days a week for just 20 minutes reported feeling less fatigued and more energized after six weeks. This is because regular exercise makes your heart and lungs work more efficiently, delivering oxygen and vital nutrients around the body. Reboot your energy: Next time you’re tempted to flop on the sofa, force yourself up for a brisk 10-minute walk – you’ll feel more alert for it.