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.
Pneumonia. Lower lobe pneumonia can cause left side abdominal pain in the form of a sharp or crushing sensation. They will also have fever and a cough which may be productive causing brown or yellow phlegm. Pneumonia is caused by an inflammation of the lower part of the lung and it can cause upper left abdomen pain.. Diverticulitis. Diverticulitis is the most common cause of pain in the lower part of abdomen. When experiencing diverticulitis, most of the pain will occur in the lower region of the abdomen and almost always on the left side. This generally occurs after age 60.