First of all, low-back pain is pandemic in much of the world. And, it is especially common in countries where most women wear clothing that prevents sun exposure to the skin. One of the first studies to show an association between LBP and reduced sun exposure was done in England: Northerners were 3-4 times as likely to suffer low-back pain as southerners. Of course, we know that there is less sunshine in the north.
Other low-back pain research shows similar results based on latitudes.
Hence, it is no surprise that research done in Southeast Asian countries shows an equally impressive result for sun exposure. Low-back pain increases from southern to northern latitudes, starting at 5º North (Malaysia – 8.8% low-back pain rate), continuing to 23º N (10.2% low-back pain rate), then 32º N (13%), and finally to 40º N (Beijing — 15.8%). Furthermore, another study by showed that vitamin D deficiency was common among those suffering from low-back pain. It was three-times more common than among those who did not suffer from low-back pain. The researchers stated, “The major determinant of hypovitaminosis D in our patients is limited sun exposure.”
Low-back pain research from Saudi Arabia and Pakistan
In addition, similar findings have been reported in Saudi Arabia and Pakistan. Researchers did a study on undergraduates in those areas. They researchers wanted to assess the students awareness regarding vitamin D deficiency associated with lack of sun exposure. These students often suffered from fatigue and muscular pain. Researchers concluded that many of them were acquainted with vitamin D deficiency, and some used a supplement. However, the investigators seemed to feel that supplements were not sufficient. They believed that sun exposure was the best method to maximize vitamin D levels.
In conclusion, they stated that the role of the sun, and the proper time and duration of exposure, could not be ignored. That is, if the students were to help effect a healthy and active society. Furthermore, they also indicated that since these students would be medical care givers in the future, their habits should be similar to the habits they intended to recommend to their future patients.
My conclusion about sun exposure and low-back pain.
In conclusion, it appears that sunlight, whether or not accompanied by vitamin D production, is effective for relief. Try a few minutes of non-burning sun exposure daily to ease the low-back pain. Remember how vital regular, non-burning sun exposure is for human health. For more information, read my new book, Embrace the Sun, available at Amazon. https://www.amazon.com/Embrace-Sun-Marc-B-Sorenson/dp/069207600X/ref=sr_1_1?ie=UTF8&qid=1534654532&sr=8-1&keywords=embrace+the+sun+sorenson
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 Walsh K, Cruddas M, Coggon D. Low back pain in eight areas of Britain. J Epidemiol Community Health. 1992 Jun;46(3):227-30.
 Zeng QY, Chen R, Xiao ZY, Huang SB, Liu Y, Xu JC, Chen SL, Darmawan J, Couchman KG, Wigley RD, Muirden KD. Low prevalence of knee and back pain in southeast China; the Shantou COPCORD study. J Rheumatol. 2004 Dec;31(12):2439-43.
 Lotfi A, Abdel-Nasser AM, Hamdy A, Omran AA, El-Rehany MA. Hypovitaminosis D in female patients with chronic low back pain. Clin Rheumatol. 2007 Nov;26(11):1895-901
 Al Faraj S, Al Mutairi K. Vitamin D deficiency and chronic low back pain in Saudi Arabia. Spine (Phila Pa 1976). 2003 15;28(2):177-9.
 Qureshi AZ, Zia Z, Gitay MN, Khan MU, Khan MS. Attitude of future healthcare provider towards vitamin D significance in relation to sun exposure. Saudi Pharm J. 2015 Oct;23(5):523-527.