This condition occurs most often as part of a symptom complex. It is difficulty in initiating and sustaining activity due to a lack of energy and accompanied by a desire to rest. This condition is normal after physical exertion, prolonged stress and sleep deprivation.

This is an acute infection of the intestine caused by Shigella sp. Symptoms include: fever, nausea, vomiting, and diarrhea that is usually bloody. Diagnosis is clinical and confirmed by stool culture. Treatment of mild infection is supportive mostly with rehydration; antibiotics are given to severely ill and high-risk patients with bloody diarrhea.

This is a common sleep disorder that can make it hard to fall asleep, hard to stay asleep, or cause you to wake up too early and not be able to get back to sleep. You may still feel tired when you wake up. It can sap not only your energy level and mood but also your health, work performance and quality of life.