Night sweats (NS) is a common patient complaint, affecting about a third of hospitalized patients on medical wards1. Despite its long list of potential causes, direct relationship between the often- cited conditions and NS is usually unclear2, its cause may remain elusive In about a third to half of cases in the primary care setting, and its prognosis, at least in those >65 y of age, does not appear to be unfavorable 2,3.
Selected commonly and less frequently cited conditions associated with NS are listed (Table)2-9. Although tuberculosis is one of the first conditions we think of when faced with a patient with NS, it should be emphasized that NS is not common in this disease (unless advanced) and is rare among hospitalized patients as a cause of their NS1,9.
In one of the larger study of adult patients seen in primary care setting, 23% reported pure NS and an additional 18% reported night and day sweats5; the prevalence of NS in both men and women was highest in 41-55 y age group. In multivariate analyses, factors associated with pure NS in women were hot flashes and panic attacks; in men, sleep disorders.
Table. Selected causes of night sweats
||Less frequently cited
|Neoplastic/hematologic (eg, lymphoma, leukemia, myelofibrosis)
Infections (eg, HIV, tuberculosis, endocarditis)
Endocrine (eg, ovarian failure, hyperthyroidism, orchiectomy, carcinoid tumor, diabetes mellitus [nocturnal hypoglycemia], pheochromocytoma)
Rheumatologic (eg, giant cell arteritis)
|Gastroesophageal reflux disease
Drugs (eg, anti-depressants, SSRIs, donepezil [Aricept], tacatuzumab)
Sleep disturbances (eg, obstructive sleep apnea)
Panic attacks/anxiety disorder
- Lea MJ, Aber RC, Descriptive epidemiology of night sweats upon admission to a university hospital. South Med J 1985;78:1065-67.
- Mold JW, Holtzclaw BJ, McCarthy L. Night sweats: A systematic review of the literature. J Am Board Fam Med 2012; 25-878-893.
- Mold JW, Lawler F. The prognostic implications of night sweats in two cohorts of older patients. J Am Board Fam Med 2010;23:97-103.
- Mold JW, Holtzclaw BJ. Selective serotonin reuptake inhibitors and night sweats in a primary care population. Drugs-Real World Outcomes 2015;2:29-33.
- Mold JW, Mathew MK, Belgore S, et al. Prevalence of night sweats in primary care patients: An OKPRN and TAFP-Net collaborative study. J Fam Pract 2002; 31:452-56.
- Feher A, Muhsin SA, Maw AM. Night sweats as a prominent symptom of a patient presenting with pulmonary embolism. Case reports in Pulmonology 2015. http://dx.doi.org/10.1155/2015/841272
- Rehman HU. Vitamin B12 deficiency causing night sweats. Scottish Med J 2014;59:e8-11.
- Murday HK, Rusli FD, Blandy C, et al. Night sweats: it may be hemochromatosis. Climacteric 2016;19:406-8.
- Fred HL. Night sweats. Hosp Pract 1993 (Aug 15):88.
Several case reports in the literature have stressed the association of bladder dysfunction (BD) with chronic alcohol abuse1,2. Although some cases may be associated with concurrent thiamine deficiency (with its attendant neuropathy), other cases of BD do not appear to be. The mechanism of BD in this setting may be related to the toxic effect of alcohol on peripheral, autonomic and/or central nervous systems2,3.
Binge drinking may also be associated with urinary retention, with spontaneous atraumatic urinary bladder rupture having been reported on several occasions4. Lastly, alcohol withdrawal alone may precipitate urinary retention5.
Unfortunately, many cases of abdominal pain due to urinary retention in the setting of alcohol abuse or withdrawal may be mistakenly attributed to ascites or other causes5. High index of suspicion for BD is essential to minimize its complications.
In our patient, given the low prevalence of benign prostatic hypertrophy in men less than 40 years of age, urinary retention due to alcohol-related BD is more likely.
- Yuan R, Carcciolo VJ, Kulaga M. Chronic abdominal distension secondary to urinary retention in a patient with alcoholism. JAMA 2002;287;318-19.
- Sheremata WA, Sherwin I. Alcoholic myelopathy with spastic urinary bladder. Dis Nerv Syst 1972;33:136-139.
- Mellion M, Gilchrist JM, De La Monte S. Alcohol-related peripheral neuropathy: nutritional, toxic or both? Muscle Nerve 2011;43:309-16.
- Muneer M, Abdelrahman H, El-Menyar A, et al. Spontaneous atraumatic urinary bladder rupture secondary to alcohol intoxication: a case report and review of literature. Am J Case Rep 2015;16:778-81.
- Iga J-I, Taniguchi T, Ohmori T. Acute abdominal distension secondary to urinary retention in a patient after alcohol withdrawal. Alcohol Alcoholism 2005;40:86-87.
High serum B12 levels, aka hypercobalaminemia (HC), is not rare among hospitalized patients with 1 study reporting “high” (813-1355 pg/ml) and “very high” (>1355 pg/ml) serum B12 levels in 13 and 7% of patients, respectively1. Common causes include excess B12 intake, solid neoplasms (particularly, hepatocellular carcinoma and metastatic neoplastic liver disease), blood disorders (eg, myelodysplastic syndrome, CML, and acute leukemias, particularly AML3), and other liver diseases, including alcohol-related diseases as well as acute and chronic hepatitis. Other inflammatory states and renal failure have also been reported2.
Paradoxically, even in the presence of HC, a functional B12 deficiency may still exist. This may be related to poor B12 delivery to cells due to its high binding by transport proteins transcobalamin I and III in HC which may in turn cause a decrease in the binding of B12 to transcobalamin II, a key player in B12 transport to tissues2. In this setting, elevated serum methylmalonic acid and homocysteine levels may be helpful.
- Arendt JFB, Nexo E. Cobalamin related parameters and disease patterns in patients with increased serum cobalamin levels. PLoS ONE 2012;9:e45979.
- Andres E, Serraj K, Zhu J. et al. The pathophysiology of elevated vitamin B12 in clinical practice. Q J Med 2013;106:505-515.
Short answer: Yes! Although the essential role of VD in calcium homeostasis and bone health is widely recognized, the extra-skeletal impact of its deficiency is often overlooked, including its effect on muscle function. In fact, in 30% of patients, VD deficiency may present as proximal muscle weakness before any biochemical signs develop (eg, hypocalcemia, high alkaline phosphatase), likely mediated through VD receptors in muscle tissue 1,2.
A recent meta-analysis of fall prevention with supplemental vitamin D concluded that at a dose of 700-1000 IU, supplemental vitamin D reduced falls by 19% within 2-3 months of treatment initiation among patients 65 y or older2; this benefit was not affected by type of supplemental VD, gender, age, or level of independence, and may be independent of additional calcium supplementation. No fall reduction was observed with a daily dose < 700 IU or achieved serum 25 (OH)D levels below 60 nmol.
- Rasheed K, Sethi P, Bixby E. Severe vitamin D deficiency induced myopathy associated with rhabdomyolysis. N Am J Med Sci 2013;5:334-336.
- Bischoff-Ferrari HA, Dawson-Hughes B, Orav JE, et al. Fall prevention with supplemental and active forms of vitamin D: a meta-analysis of randomized controlled trials. BMJ 2009;339:b3692.