All sorts of different studies are pointing to how lack of sleep damages brain cells. One recent study found that in mice 25% of certain brain cells died as a result of a prolonged lack of sleep. Other studies have found lower integrity white matter in the brain, possibly as a result of lack of sleep.
1 Food poisoning; food poisoning can also cause pain in the lower left abdomen. 2  Moreover, it can cause nausea, vomiting or diarrhea and fever. 3  Symptoms usually occur for 24-48 hours. 4  For some cases, need to be hospitalized.
Diverticulitis is a common cause of left lower abdominal and back pain, and an increasingly frequent reason for hospital stays. As you age, small pouches can develop along the walls of the colon. Most commonly, these pouches develop in the sigmoid colon, located on the left side of the abdomen. Diverticulitis occurs when bacteria get stuck in these pouches and they become infected. The infection causes inflammation of the colon, resulting in pain in the left lower abdomen that might also be felt in the back.