Dear Editor: Upper gastrointestinal (GI) symptoms are common in the general population and they are usually divided into dyspepsia and gastro-oesophageal reflux disease (GERD) (1). Previous studies have reported a high prevalence of GERD in respiratory disorders (2, 3). In contrast to asthma, the prevalence and the exact association between upper GI and respiratory symptoms is not well recognised in the setting of chronic obstructive pulmonary disease (COPD) (4-6). Recently, we have evaluated prospectively 79 consecutive patients (64 men, mean age 73 ± 11 years) with known history of COPD established with pulmonary function tests. At the day of evaluation, demographic and clinical data including smoking and alcohol status, coffee consumption, coexistent diseases/medication and body mass index were recorded. In each patient, the frequency and severity (using a scale from zero to four) of GERD symptoms (heartburn and/or regurgitation) as well as dyspepsia symptoms (such as nausea, hunger pain in the stomach and/or stomach ache) during the previous year were evaluated. In addition, the number of COPD exacerbations (defined as episodes of worsening dyspnoea, cough, wheezing, increased inhaler/antibiotics use or admission to the hospital because of respiratory symptoms) during the last year were also assessed. Multivariable linear regression analysis was used to identify the independent risk factors associated with the number of exacerbations of COPD. In our cohort, 45 (57%) patients reported at least one monthly episode of GERD symptoms (heartburn and/or regurgitation). Thirty-two (40.5%) and 36 (46%) patients had heartburn and regurgitation during the last year respectively. In addition, 56 (71%) patients had one or more episodes of dyspepsia per month. Exacerbations of COPD occurred at a median of three (range 0–14) times in the previous year. Forty-seven patients [60%, group 1: 42 men, 71 ± 10 years, forced expiratory volume in 1 s (FEV1): 1.3 ± 0.42 l] had ≤ 3, and 32 (40%, group 2: 22 men, 75 ± 9 years, FEV1: 1.4 ± 0.35 l) had > 3 exacerbations of COPD. In the univariate analysis, group 1, compared with group 2 patients, had less frequent regurgitation (p < 0.001), heartburn (p = 0.05), stomachache (p = 0.002) and nausea (p = 0.002) and used less frequently oxygen therapy (p = 0.05). Medications (e.g. proton pump inhibitors, non-steroidal anti-inflammatory drugs) and pulmonary function tests [forced vital capacity, FEV1, FEV1 (%) and peak expiratory flow (PEF)] were not significantly different between the two groups of patients. In addition, none of the patients was under theophylline therapy, while administration of inhaled corticosteroids was not significantly different between the two groups (78% vs. 81%, p > 0.05). The independent factors associated with > 3 exacerbations of COPD were regurgitation (p < 0.001) and nausea (p = 0.05) (Table 1). Interestingly, patients with ≥ 1 episodes of nausea per month, compared with those without nausea, had significantly lower PEF (45 ± 18 vs. 72 ± 26, respectively, p = 0.01). Severity of GERD symptoms was not significantly associated with exacerbations of COPD. It is estimated that GERD symptoms once or more per month occur in 40% of general adult population (5). In accordance with previous studies (5, 7), we found that our COPD patients had higher prevalence of GERD symptoms per month (57%). On the other hand, frequent exacerbations of respiratory symptoms may have a negative impact on lung function and their prevention should be a major target in COPD (8). Although the exact relationship between COPD and GERD is not well established (5, 7), we found that the number of COPD exacerbations was significantly associated with GERD symptoms (regurgitation). Thus, similar to asthma, GERD may exacerbate COPD symptoms and/or vice versa. In addition, for the first time, we evaluated dyspepsia symptoms and we found that nausea was also significantly associated with exacerbations of COPD and it was recorded significantly more frequently in patients with advanced COPD (as detected by PEF). We believe that these findings may have important preventive and therapeutic implications and may further elucidate the mechanisms, which are implicated in pathogenesis and exacerbations of COPD/GERD symptoms.