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.
Your stomach is located on the left side of your abdomen and can be filled up with gas when you swallow. These trapped gases can trigger nerve pain in the stomach which is experienced as sharp pain under left breast. Heart burn. Heart burn is a common cause of chest pain, particularly beneath the left breast. It is caused by stomach acid that travels up the esophagus and irritates the esophageal mucosa.