Anxiety disorders, including panic disorder with or without agoraphobia, generalized anxiety disorder (GAD), social anxiety disorder (SAD), specific phobias, and separation anxiety disorder, are the most common mental disorders, affecting up to 33.7% of the population during their lifetime. These disorders are highly comorbid with other mental disorders and are associated with significant healthcare costs and a high burden of disease. Despite their prevalence, they are often underdiagnosed and undertreated. There is no evidence that the prevalence of anxiety disorders has changed in recent years, and cross-cultural variations in prevalence rates are more likely due to methodological differences than cultural influences. Anxiety disorders have a chronic course, with a natural decline in prevalence with age. Epidemiological studies are crucial for understanding the burden of anxiety disorders and planning treatment and prevention programs. These studies use various prevalence rates, including lifetime, annual, and point prevalence. Community surveys are considered the most reliable method for obtaining accurate prevalence rates, as they are representative and not confounded by treatment-seeking behavior. However, they may overestimate prevalence due to diagnostic challenges and the use of lay interviewers. The prevalence of anxiety disorders varies across different populations and is influenced by factors such as gender, age, and ethnicity. Women are more likely to be affected than men, with a female-to-male ratio of approximately 2:1. The median age of onset for anxiety disorders is around 11 years, with specific phobias and separation anxiety disorder starting earliest. Anxiety disorders are most common in adolescence and early adulthood, with a peak in middle age followed by a decline in older age groups. Healthcare utilization for anxiety disorders is variable, with some disorders, like panic disorder, leading to more frequent healthcare visits. However, many patients seek help only after prolonged symptoms. Effective treatments, including medication and cognitive behavioral therapy (CBT), are available, but underrecognition and undertreatment remain significant issues. Despite these challenges, there is no evidence of a significant increase in the prevalence of anxiety disorders over the past decades. The burden of anxiety disorders is substantial, with significant economic and social costs. Future research should focus on improving diagnosis, treatment, and understanding the genetic and neurobiological factors underlying these disorders.Anxiety disorders, including panic disorder with or without agoraphobia, generalized anxiety disorder (GAD), social anxiety disorder (SAD), specific phobias, and separation anxiety disorder, are the most common mental disorders, affecting up to 33.7% of the population during their lifetime. These disorders are highly comorbid with other mental disorders and are associated with significant healthcare costs and a high burden of disease. Despite their prevalence, they are often underdiagnosed and undertreated. There is no evidence that the prevalence of anxiety disorders has changed in recent years, and cross-cultural variations in prevalence rates are more likely due to methodological differences than cultural influences. Anxiety disorders have a chronic course, with a natural decline in prevalence with age. Epidemiological studies are crucial for understanding the burden of anxiety disorders and planning treatment and prevention programs. These studies use various prevalence rates, including lifetime, annual, and point prevalence. Community surveys are considered the most reliable method for obtaining accurate prevalence rates, as they are representative and not confounded by treatment-seeking behavior. However, they may overestimate prevalence due to diagnostic challenges and the use of lay interviewers. The prevalence of anxiety disorders varies across different populations and is influenced by factors such as gender, age, and ethnicity. Women are more likely to be affected than men, with a female-to-male ratio of approximately 2:1. The median age of onset for anxiety disorders is around 11 years, with specific phobias and separation anxiety disorder starting earliest. Anxiety disorders are most common in adolescence and early adulthood, with a peak in middle age followed by a decline in older age groups. Healthcare utilization for anxiety disorders is variable, with some disorders, like panic disorder, leading to more frequent healthcare visits. However, many patients seek help only after prolonged symptoms. Effective treatments, including medication and cognitive behavioral therapy (CBT), are available, but underrecognition and undertreatment remain significant issues. Despite these challenges, there is no evidence of a significant increase in the prevalence of anxiety disorders over the past decades. The burden of anxiety disorders is substantial, with significant economic and social costs. Future research should focus on improving diagnosis, treatment, and understanding the genetic and neurobiological factors underlying these disorders.