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Autism spectrum disorder is a condition that appears early in childhood development, has varying degrees of severity, and can be characterized by poor social skills, communication difficulties, and repetitive habits. People with ASD are also at an elevated risk of psychiatric disorders such as anxiety, depression, obsessive disorder, obsessive-compulsive disorder, and eating disorders. People with ASD have an impaired ability to communicate with others; they are often more comfortable with objects as a child. Inability to recognize and use these cues makes it difficult for affected individuals to understand others's feelings or to express their own emotions in a way that is appropriate. People with ASD tend to be steadfast in their established routines and can adamantly resist changes in schedule. Although ASD is characterized by social and communication issues as well as strange habits, the affected individuals can have a variety of academic abilities and language skills. The overwhelming majority of people with ASD have mild to moderate academic impairment, with others having average to above-average intelligence. Some people with ASD do not talk at all, while others use words fluently. However, fluent speakers of ASD also have difficulties with verbal communication. Asperger syndrome, on the other hand, was a disease that had previously only affected people of average or above-average intelligence who were not delayed in their language development. Many affected individuals fall outside of the narrower diagnostic frameworks, and their academic and communication skills may change over time.
Seasonal affective disorder is a medical disorder that can be attributed to the seasonal transition. Chronic sadness and a general lack of interest are typical of major depressive disorders, while bipolar disorder is characterized by similar depressive episodes alternating with periods of abnormally high energy and activity. Only during those months of the year, people with seasonal affective disorder have signs and symptoms of either major depressive disorder or bipolar disorder. Among people with seasonal affective disorder, major depressive disorder is more common than bipolar disorder. Those that are depressive disorders include a loss of interest or pleasure in activities, a decline in energy, a depressed mood, and low self-confidence. Most people with seasonal affective disorder, anxiety, and other conditions have appeared in the fall and winter months and diminishe in the spring and summer months. Typically, people with underlying bipolar disorder have alternating episodes of depression in the fall and winter months and mania in the spring and summer months. A change in diagnosis to either major depressive disorder or bipolar disorder is expected in about 40% of people with seasonal affective disorder, depressive symptoms persist after winter and do not fade in the summer months. Individuals with seasonal affective disorder have another psychiatric disorder, attention-deficit/hyperactivity disorder, an eating disorder, anxiety disorder, or panic disorder.
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