tokens: Common symptoms , which tend to be vague , include fatigue ( unrelieved by sleep ; occurs in 66 % of cases ) , lack of energy , weight loss , joint aches and pains ( which occur in about 70 % of cases ) , arthritis ( 14–38 % of cases ) , dry eyes , swelling of the knees , blurry vision , shortness of breath , a dry , hacking cough , or skin lesions .