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.
Kidney stones in the left side of the abdomen can cause the strongest pain ever felt. It can also cause vomiting as well as a spreading of the pain from the loin to the groin. When there is a buildup of minerals a stone can form down the kidney or in the ureter. The pain may be in the upper left abdomen when the stone is in this area.