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Diagnosing Night Sweats ANTHONY J Diagnosing Night Sweats ANTHONY J. VIERA, LCDR, MC, USNR, Naval Hospital Jacksonville, Jacksonville, Florida MICHAEL M. BOND, LT, MC, USNR, National Naval Medical Center, Bethesda, Maryland SCOTT W. YATES, M.D., M.B.A., Dallas, Texas Night sweats are a common outpatient complaint, yet literature on the subject is scarce. Tuberculosis and lymphoma are diseases in which night sweats are a domi- nant symptom, but these are infrequently found to be the cause of night sweats in modern practice. While these diseases remain important diagnostic considerations in patients with night sweats, other diagnoses to consider include human immuno- deficiency virus, gastroesophageal reflux disease, obstructive sleep apnea, hyper- thyroidism, hypoglycemia, and several less common diseases. Antihypertensives, antipyretics, other medications, and drugs of abuse such as alcohol and heroin may cause night sweats. Serious causes of night sweats can be excluded with a thor- ough history, physical examination, and directed laboratory and radiographic stud- ies. If a history and physical do not reveal a possible diagnosis, physicians should consider a purified protein derivative, complete blood count, human immunodefi- ciency virus test, thyroid-stimulating hormone test, erythrocyte sedimentation rate evaluation, chest radiograph, and possibly chest and abdominal computed tomo- graphic scans and bone marrow biopsy. (Am Fam Physician 2003;67:1019-24. Copy- right© 2003 American Academy of Family Physicians.) he symptom of night sweats is in Table 1.2-9 The history and physical exami- commonly encountered in nation are aimed at revealing associated clinical medicine, but there are symptoms that will narrow this broad differ- no data regarding its actual fre- ential diagnosis and guide additional studies. quency. Night sweats has been Table 2 lists diagnostic actions to be consid- Tdefined as drenching sweats that require the ered based on findings from the history and patient to change bedclothes.1 This defini- physical. tion, however, probably does not describe the majority of patients who may complain of the HISTORY symptom, and not all reports or studies cited Physicians should ask about fever, cough, through this article use this strict definition. and risk factors for tuberculosis (TB). In its The key words “night sweats” and “nocturnal pulmonary form, reactivation TB generally hyperhidrosis” were used to search the MED- presents with cough in addition to the consti- LINE literature from 1966 to July 2001, Har- tutional symptoms of weight loss and low- rison’s Principles of Internal Medicine, 13th ed. grade fever. Many patients experience night CD-ROM, and the January 1999 Physicians’ sweats several times per week. A history of (or Desk Reference (PDR) Electronic Library CD- risk factors for) human immunodeficiency ROM. Abstracts for 338 citations in the virus (HIV) infection is important. The most MEDLINE literature were reviewed for arti- common complaint with HIV infection is cles, letters, and commentaries about diag- fever, with or without night sweats. This may noses that had night sweats as a feature. There be because of the virus or the result of HIV were 16 matches for night sweats in Harri- sequelae such as lymphoma or opportunistic son’s and 11 pharmaceuticals with night infections. sweats as a reported side effect in the PDR. Most patients with acquired immunodefi- ciency syndrome (AIDS)-related lymphoma Evaluation have a history of fever, weight loss, and night An extensive list of diagnostic considera- sweats.10 AIDS-related infections might also tions in patients with night sweats is provided cause night sweats, including Mycobacterium MARCH 1, 2003 / VOLUME 67, NUMBER 5 www.aafp.org/afp AMERICAN FAMILY PHYSICIAN 1019 mined. The symptoms of infectious endo- A therapeutic trial of treatment for gastroesophageal reflux carditis are protean and include fever, chills, disease may relieve night sweats for patients who have an fatigue, sweats, and malaise. These night sweats may be related to nocturnal fever otherwise normal evaluation. caused by transient bacteremia. Low-grade fever that may be associated with night sweats is the most common sys- avium complex (MAC) infection and cyto- temic symptom of Hodgkin’s disease. High megalovirus (CMV) syndromes. MAC infec- fluctuating fevers accompanied by drenching tion in patients with HIV typically presents night sweats (Pel-Ebstein fevers) may persist with fever, weight loss, and night sweats. It is a for several weeks with Hodgkin’s disease. late complication of HIV infection that gener- Night sweats may be the only presenting com- ally occurs in patients with CD4+ cell counts of plaint for some patients. One study13 of pa- less than 100 cells per mm3. TB also can be pre- tients with Hodgkin’s disease who had sweat- sent in a patient infected with HIV.In this pop- ing as their only symptom found a correlation ulation, patients often present in the classic with unperceived elevations in body tempera- manner with cough, fever, and night sweats. ture, or minor febrile pulses. Occasionally, Sometimes, travel history is helpful in eval- patients with non-Hodgkin’s lymphoma also uating the potential for other infectious dis- may experience night sweats. eases. Persons with the chronic pulmonary A history of recent upper respiratory infec- form of histoplasmosis present similarly to tion may be significant because infectious those who have TB, with an increasing pro- mononucleosis (IM), usually caused by ductive cough, weight loss, and night sweats.11 Epstein-Barr virus, may cause night sweats, Persons with coccidioidomycosis may present particularly during the acute phase. In a with cough, fever, and night sweats.12 Risk fac- study14 where the symptoms of IM were com- tors for endocarditis also should be deter- pared with other upper respiratory infections, TABLE 1 Causes of Night Sweats Malignancy Endocrine Other Drugs (Table 3) Lymphoma Ovarian failure Obstructive sleep apnea Antipyretics (salicylates, Leukemia Hyperthyroidism Gastroesophageal reflux disease acetaminophen) Other neoplasm Diabetes mellitus (nocturnal Chronic fatigue syndrome Antihypertensives hypoglycemia) 5 Phenothiazines Infections Granulomatous disease Endocrine tumors Substances of abuse: Human immunodeficiency virus Chronic eosinophilic pneumonia (pheochromocytoma, 6 alcohol, heroin Tuberculosis Lymph node hyperplasia carcinoid tumor) Diabetes insipidus8 Over-bundling Mycobacterium avium complex 3 Orchiectomy 9 Infectious mononucleosis Prinzmetal’s angina Autonomic over-activity Fungal infections (histoplasmosis, Rheumatologic Anxiety coccidioidomycosis) Takayasu’s arteritis Pregnancy9 4 Lung abscess2 Temporal arteritis Endocarditis Other infection Information from references 2 through 9. 1020 AMERICAN FAMILY PHYSICIAN www.aafp.org/afp VOLUME 67, NUMBER 5 / MARCH 1, 2003 Night Sweats night sweats were significantly more common in patients with IM.14 By the third week of ill- Antipyretic medications can sometimes cause night sweats ness, heterophile antibodies were positive in because of a rebound effect. 90 percent of patients. If heterophile antibod- ies are not elevated, but the diagnosis is strongly suspected, IgM antibodies to Epstein- Barr virus viral capsid antigen (anti-VCA) TABLE 2 may be measured, because they can be ele- Evaluation of Night Sweats Based on Associated Symptoms or Signs vated for weeks to months after infection. Women in the appropriate age range should be asked about symptoms of menopause, Associated symptoms or signs Action to consider because patients with ovarian failure may ex- Fever, TB exposure, HIV status Purified protein derivative, chest radiograph, perience hot flushes. Some women may expe- or risk factors, cough, weight CBC, HIV test (CD4+ if known HIV rience a predominance of these during noc- loss, immunocompromise positive), possibly blood cultures turnal hours.15 An elevated follicle-stimulating Menopausal Hormone replacement therapy (an elevated hormone test may be helpful in diagnosing FSH test if uncertain based on history, helps confirm the diagnosis) menopause when the history is unclear. Firm lymphadenopathy in Lymph node biopsy Patients with diabetes experiencing noctur- absence of current or recent nal hypoglycemia may have night sweats with- infection 16 out other hypoglycemic symptoms. This Recent upper respiratory tract CBC; heterophile antibodies or anti-VCA may be caused by missing a meal or perform- infection evaluation ing unusually excessive exercise. Patients who Diabetic Rule out nocturnal hypoglycemia are receiving large doses of evening insulin Overweight; excessive daytime Sleep study may be especially prone to nocturnal hypo- sleepiness, partner reports loud glycemia.17 Risk factors for hypoglycemia may snoring and gasping during include tight diabetes control, renal insuffi- sleep, small oropharynx ciency, polypharmacy, higher sulfonylurea or Heartburn, indigestion Trial of histamine H2 blocker insulin doses, and advanced age.17 Heat intolerance, exophthalmos, Thyroid function test An association between gastroesophageal tremor, other symptoms or reflux disease (GERD) and night sweats has signs of hyperthyroidism been suggested. Informal observations suggest Labile hypertension, paroxysms Urine catecholamines or metanephrines of headache or palpitations measured in a 24-hour collection; if that patients treated for GERD often have dra- diagnosed, the tumor must be localized 18 matic relief of their night sweats. using radiologic imaging Physicians should
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