Fatigue in RA: Worse in Winter? Swedish study says yes

multiple determinants of fatigue among people with RA, and may in part reflect a connection to seasonal affective disorder, which is known to affect symptoms of depression (including fatigue) in the general population." Feldthusen and colleagues suggested several factors that could contribute to seasonal variations in fatigue, including physical activity, which correlates inversely with fatigue and tends to be more frequent in the spring and summer. Vitamin D deficiency also could contribute, as might the large variations in temperature and daylight hours in Sweden. In addition, most of the study participants were working or were students and may have taken vacations in the summer.http://www.medpagetoday.com/Rheumatology/Arthritis/56160?xid=nl_mpt_DHE_2016-02-13&eun=g721819d0r