Anxiety disorders are one of the most common mental disorders in the modern world. The COVID-19 pandemic has led to the onset of many mental disorders in people who did not have them before. It can be suspected that in people who already had anxiety disorders before the pandemic, their quality of life has significantly deteriorated. The aim of the study was to assess the relationships between life satisfaction, acceptance of illness, the severity of anxiety and depression symptoms and health behaviors in a group of patients diagnosed with anxiety disorders during the COVID-19 pandemic. The study was conducted in the period from March 2020 to March 2022. There were 70 people among the respondents, including 44 women aged 44.06 ± 14.89 years and 26 men aged 40.84 ± 16.72 years. All persons were diagnosed with generalized anxiety disorder. Patients with other co-occurring disorders were excluded, i.e., depression and signs of organic damage to the central nervous system, as were those with cognitive disorders that prevented the completion of the questionnaires. The following scales were used in the study: the Satisfaction with Life Scale (SWLS), Acceptance of Illness Scale (AIS), Health Behavior Inventory (HBI) and Hospital Anxiety and Depression Scale (HADS). Spearman's rank correlation coefficient and the Mann-Whitney U test were used for statistical analyses. In the Satisfaction in Life questionnaire, the respondents obtained an average score of 17.59 ± 5.74 points. In the AIS scale, the mean score obtained by the patients was 27.10 ± 9.65 points. In the overall Health Behavior Inventory (HBI), the average score was 79.52 ± 15.24 points. In the HADS questionnaire, probants obtained an average of 8.17 ± 4.37 points in the depression subscale and 11.55 ± 4.46 points in the anxiety subscale. In addition, there were significant negative correlations between life satisfaction (SWLS) and the severity of anxiety and depression (HADS). The lower the perceived quality of life, the significantly higher the anxiety and depressive disorders. The result obtained in the Health Behavior Inventory (HBI) as well as in the subscale of Prohealth Activities (PHA) was negatively associated with the severity of anxiety symptoms. Prohealth activities should therefore be developed to prevent anxiety disorders, as well as to promote positive mental attitudes. In the study, the average result obtained in the subscale of positive mental attitudes correlated negatively with both anxiety and depressive symptoms. Life during the pandemic was assessed by patients as unsatisfactory. Health-promoting behaviors, and especially positive mental attitudes, may play a protective role in relation to anxiety and depressive symptoms in a situation of increased stress related to the COVID-19 pandemic in a group of patients with anxiety disorders.