Stress can be caused by external or internal influences and disrupt well-being. During childhood, school is a major source of stress through homework, tests, grades, and social comparisons. Stress can also result from moving to a new culture or experiencing community violence. There are three types of stress: positive stress from short-term challenges, tolerable stress from more intense but brief challenges, and toxic stress from prolonged, intense challenges over weeks or months. Physical symptoms of stress include changes in appetite, headaches, and sleep issues, while emotional symptoms include anxiety, worries, anger, and inability to control emotions. Children can cope with stress through emotion-focused strategies like managing feelings or problem-focused strategies like addressing the stressful situation directly.