Finally, sleep deprivation may lead to other physical signs and non-specific somatic (soma is Latin for body) complaints. Aside from the sense of fatigue described above, you may have other generalized symptoms of discomfort. You may have a feeling of malaise, which might manifest as feeling run-down or simply "not well." You might have aches or pains in your body. You may complain of an upset stomach or gastrointestinal symptoms, such as diarrhea. Medical investigation into these problems might not lead to their resolution if the underlying cause is overlooked and the symptoms are instead due to unrecognized sleep deprivation.