Hello, * There are an ample number of conditions, which can give above-mentioned symptoms as - low hemoglobin - lower respiratory tract infection as bronchitis or pneumonia - stress and anxiety - alteration of blood sugar as hypoglycemia - low blood pressure - dehydration with lesser oral intake than a requirement - excess perspiration from sun exposure - side effect of certain drugs as cocaine or else (if applicable). Hope I have answered your query. Let me know if I can assist you further. Take care Regards, Dr Bhagyesh V. Patel, General Surgeon