vitamin d deficiency neurological symptoms

1Faiza A. Qari, FRCP, ABIM, Division of Inner Medication/Endocrinology, King Abdulaziz Medical Metropolis, Jeddah, Saudi Arabia.

2Tariq A. Nasser, ABIM, Division of Inner Medication/Endocrinology, King Abdulaziz Medical Metropolis, Jeddah, Saudi Arabia.





Some of the necessary causes of osteomalacia is vitamin D deficiency.1 Vitamin D3 (cholecalciferol) is synthesized non-enzymatically within the pores and skin from 7-dehydrocholesterol throughout publicity to ultraviolet rays in daylight.2 The etiological causes of vitamin D deficiency are attributable to restricted publicity to daylight mixed with lack of vitamin D-fortified meals or malabsorption.3 Alternatively, impaired hydroxylation of vitamin D within the liver or kidney can stop the metabolism of the vitamin into its physiologically energetic type.4 Though sunshine is ample in Saudi Arabia all year long, the native inhabitants avoids publicity to daylight with a purpose to keep cool and for socio-cultural causes.5,6 A overwhelming majority of the inhabitants makes use of headgear, and Saudi ladies specifically have adopted a strict clothes code; they cowl most of their our bodies after they depart their properties. This, along with the results of excessive parity and extended breastfeeding, places them at excessive danger of growing vitamin D deficiency.

The standard medical manifestations of vitamin D deficiency embody nonspecific backache, bone ache, and generalized physique ache.7 Progressive proximal muscle weak point, gait disturbances, carpopedal spasm, and bone deformity are atypical manifestations of this deficiency.8 As sufferers with osteomalacia might need extreme neurological shows even in instances of gentle vitamin D deficiency and bone profile, you will need to conduct an observational research in medical follow with a purpose to assess the affiliation between vitamin D ranges and illness presentation, particularly for atypical neurological and rheumatological shows.9 Thus, the target of this research was to analyze the correlation between the neurological and rheumatological manifestations of vitamin D deficiency and the degrees of 25-hydroxyvitamin [25(OH) D] and bone profile (calcium, phosphate, magnesium and alkaline phosphatase).



We carried out a case collection research on sufferers who had been adopted up on the Endocrinology Outpatient Clinics of King Abdulaziz College Hospital, Jeddah from January 2010 to December 2011. Consent was obtained from the individuals previous to their inclusion within the research. The research was authorized by the Biomedical Ethics Analysis Committee of King Abdulaziz College.

We included all sufferers with a analysis of vitamin D deficiency, which was primarily based on findings of low serum 25(OH) D ranges and never on outcomes of bone profile.

A guide endocrinologist evaluated all of the sufferers enrolled within the research. For all sufferers, we recorded the next data: detailed signs and indicators, dietary historical past, length and severity of sickness, related sicknesses, solar publicity of <60 minutes per week, renal illness, gastrointestinal tract illness, and use of anticonvulsants resembling diphenylhydantoin sodium. Biochemical knowledge, radiological findings, and the therapies administered (vitamin D and calcium dietary supplements) had been additionally recorded. For the aim of this research, neurological manifestations had been outlined as experiences of paresthesia, tetany, and progressive proximal myopathy together with incapacity to stroll and stand up from a squatting place and waddling gait. Rhematological manifestations had been outlined as myalgia, arthralgia, and fractures. Statistical Evaluation: Evaluation was carried out utilizing the Statistical Package deal for Social Sciences (SPSS), model 16. The t-test was used to research the affiliation between the neurological and rheumatological manifestations of vitamin D deficiency and 25(OH) D ranges and bone profile.  


In complete, 60 sufferers had been enrolled within the research. The imply ± SD age of the sufferers was 31 ± 13.7 years (vary, 13–60 years). There have been 15 males and 45 ladies, with a males to ladies ratio of 1:4.

Probably the most frequent typical manifestation of 25 (OH) D deficiency was bone ache, which was noticed in 48 sufferers (80%). Different typical shows included backache (56%), mylagia and bone tenderness (72%).

There have been totally different neurological medical manifestations of 25 (OH) D deficiency. Progressive muscle weak point was noticed in 73.0% of the sufferers, who had an atypical presentation; proximal weak point was extra frequent than distal weak point. Amongst the sufferers with proximal weak point, six (20%) had extreme signs, which led to wheelchair-bound states. The weak point was reasonable in 22 sufferers (42%). Sufferers with extreme signs had important restriction of actions of every day residing with incapacity to stand up from a squatting place and waddling gait. Gait disturbance was famous in 61.7% of sufferers who had atypical shows. These sufferers had been handled with vitamin D dietary supplements and calcium, and 46% of them confirmed a dramatic response to therapy. The least frequent neurological medical manifestations noticed in our research group included tetany and paresthesia (9% and 18%, respectively.

The most typical etiology of 25 (OH) D deficiency was restricted solar publicity in many of the instances. Vitamin D deficiency of dietary and celiac origin had been noticed in 5% and 14% of the instances, respectively. Miscellaneous causes included anticonvulsant treatment (phenytoin), oncogenic osteomalacia (tumor induced osteomalacia), vitamin D-resistant rickets, and persistent kidney ailments in 5 instances. These sufferers had renal osteodystrophy and osteomalacia within the type of low or regular calcium ranges, excessive phosphate ranges, metabolic acidosis, and low 1,25-dihydroxyvitamin D3 ranges.

The radiological findings of sufferers with 25(OH) D deficiencies had been osteopenia (60%), adopted by Looser’s zone (43%). Different radiological findings had been bowed legs and true fractures. In 10% of the instances, radiological findings had been regular.

The bone profile of sufferers with 25(OH) D deficiencies is proven in Desk-I, whereas Desk-II exhibits the correlation between the degrees of 25(OH) D and bone profile (calcium, magnesium, phosphate, alkaline phosthatase and PTH) with the presence or absence of neurological shows within the topics.

There was no important affiliation between low ranges of 25(OH) D and neurological manifestations of vitamin D deficiency or between deficiencies in 25(OH) D and bone profile. The one important affiliation noticed was between issue in strolling and the degrees of calcium and phosphate (P = 0.043 and 0.037, respectively) (Desk-II).


DISCUSSION – “vitamin d deficiency neurological symptoms”

Vitamin D deficiency is the most typical reason for osteomalacia, and it usually outcomes from restricted publicity to daylight, dietary deficiency, or celiac illness.3,4 Restricted solar publicity happens in homebound individuals, dark-skinned people, heavy sunscreen customers, and people who have restricted publicity for social, cultural, or well being causes. Within the case of our sufferers, who all resided in Saudi Arabia, extreme clothes and masking of the pores and skin was the most typical reason for restricted publicity to daylight (68%). The etiology of vitamin D deficiency in our sufferers was associated to a mixture of the dearth of solar publicity attributable to carrying of the standard costume, darkish pores and skin coloration, and poor dietary habits.6 Celiac disease10 was the second frequent reason for osteomalacia in our research group (20%). As well as, different causes included anticonvulsant remedy (phenytoin),11,12 tumor-induced osteomalacia,13,14 familial vitamin D-resistant rickets, and renal osteodystrophy15
. Nevertheless, our commentary that decreased consumption of food16 contributed to 25(OH) D deficiency in solely 5% of our research inhabitants, which could possibly be the results of our failure to report particular particulars upon historical past taking.

Medical shows: Beforehand reported non-specific signs, resembling again ache,17 arthralgia,18 and bone tenderness19 had been noticed in nearly all sufferers. It was obvious that our sufferers with vitamin D deficiency could not current with typical medical shows of osteomalacia; nonetheless, they might current with an atypical neurological presentation resembling extreme proximal myopathy.20,21 This can be accompanied with morbidities, together with waddling gait and issue in strolling, which had been reported in 73% and 61% of the instances, respectively.22

Hypophosphatemia, excessive ranges of parathyroid hormone, and low ranges of calcitriol are the mechanism of myopathy.23 Experimental research have additionally proven that skeletal muscle comprises vitamin D receptors that particularly bind to 1, 25(OH) D3 and modulate varied transcription components in muscle cells.24 The components that contributed to muscle weak point in our sufferers had been attributable to neurotoxic results, which resulted from muscle cell proliferation and differentiation into mature muscle fibers as elevated parathyroid hormone ranges.25

Primarily based on radiological findings, lowered bone density with thinning of the cortex (osteoporosis) was the most typical discovering (60%) in our research, which is in keeping with the outcomes of a current research.26 Looser’s zones (pseudo-fractures) are the attribute radiologic findings in osteomalacia;27 these seem as fissures or slim radiolucent strains with sclerotic borders mendacity perpendicular to the cortical margins. These had been noticed in 45% of our sufferers.28 Nevertheless, we discovered no important statistical correlation between radiological options and bone parameters and vitamin D ranges.

Correlation between 25(OH) D deficiency and neurological medical shows: On this research, we investigated the correlation between the bone profile, 25(OH) D ranges, parathyroid hormone ranges and atypical neurological signs (Desk-II).29 In consequence, we concluded that sufferers with low 25(OH) D ranges could have neurological shows resembling issue in strolling and proximal myopathy;30 nonetheless, there was no important affiliation between neurological and rheuamatological manifestations and bone profile and 25(OH) D ranges.29,30 The absence of a big affiliation between extreme signs and low 25(OH) D ranges might be defined by the truth that even at low 25(OH) D ranges, there may be adequate 1, 25 (OH) 2 D3 to keep up homeostasis. Certainly, there could also be (over) energetic conversion of 25 (OH) D to 1,25 (OH)2 D3 to keep up bone mass. Nevertheless, additional research are required to elucidate the precise nature of this mechanism.

Response to Remedy
: Sufferers initially confirmed important medical enchancment after therapy with vitamin D and calcium.31 Nevertheless, observe up was inefficient as a result of we couldn’t get hold of related data for assessing the medical and biochemical response to long-term therapy. This made it not possible to precisely assess their response to therapy. Nevertheless, it’s value noting that the response to therapy in 46% of the sufferers with extreme proximal myopathy was dramatic.32

A few of our wheelchair-bound sufferers additionally responded dramatically to therapy. After many months of incapacity, they had been capable of ambulate independently and performance usually with easy medical therapy.33 Nevertheless, the rationale for therapy failure in the remainder of the sufferers with myopathy was unclear. They had been adopted up by a neurologist and rheumatologist. Some underwent additional investigations, resembling electromyography and muscle biopsy for myopathy.34

Limitations: This research has a number of limitations. First, we didn’t report particular dietary historical past, together with the consumption of milk or milk merchandise for all sufferers included within the research. Second, there was an absence of formal documentation of the response to therapy and observe up of biochemical modifications.



Though sufferers with vitamin D deficiency had neurological and rheumatological indicators and signs, together with issue in strolling extreme proximal myopathy, and fractures, we didn’t discover any affiliation between these and the degrees of 25(OH) D or bone profile (calcium, magnesium, phosphate, and alkaline phosphatase). Additional investigations are wanted to clarify why extreme neurological shows of vitamin D deficiency usually are not correlated with low ranges of vitamin D. These observations are crucial in medical follow for the administration of vitamin D deficiency.


Monetary/nonfinancial disclosures: The authors have reported no important conflicts of curiosity exist with any corporations/organizations whose services or products could also be mentioned on this article.

Funding assist: None.


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