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The prevalence of each of the three symptoms were markedly higher in severe patients than nonsevere patients (19%<jats:italic>versus<\/jats:italic>10% for weakness, p=0.003; 14%<jats:italic>versus<\/jats:italic>7% for palpitations, p=0.007; 12%<jats:italic>versus<\/jats:italic>7% for dyspnoea, p=0.014). Results of multivariable regression showed increased odds of ongoing symptoms among severe patients (OR 1.7, 95% CI 1.1\u20132.6; p=0.026) or patients with longer hospital stays (OR 1.03, 95% CI 1.00\u20131.05; p=0.041). Pulmonary function test results were available for 81 patients, including 41 nonsevere and 40 severe patients. In this subgroup, 44 (54%) patients manifested abnormal diffusing capacity of the lung for carbon monoxide (<jats:italic>D<\/jats:italic><jats:sub>LCO<\/jats:sub>) (68% severe<jats:italic>versus<\/jats:italic>42% nonsevere patients, p=0.019). Chest computed tomography (CT) total severity score &gt;10.5 (OR 10.4, 95% CI 2.5\u201344.1; p=0.001) on admission and acute respiratory distress syndrome (ARDS) (OR 4.6, 95% CI 1.4\u201315.5; p=0.014) were significantly associated with impaired<jats:italic>D<\/jats:italic><jats:sub>LCO<\/jats:sub>. Pulmonary interstitial damage may be associated with abnormal<jats:italic>D<\/jats:italic><jats:sub>LCO<\/jats:sub>.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>Pulmonary function, particularly<jats:italic>D<\/jats:italic><jats:sub>LCO<\/jats:sub>, declined in COVID-19 survivors. This decrease was associated with total severity score of chest CT &gt;10.5 and ARDS occurrence. 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