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Causes of anxiety

•Stress at work
•Stress from school
•Stress in a personal relationship such as marriage
•Financial stress
•Stress from an emotional trauma such as the death of a loved one
•Stress from a serious medical illness
•Side effect of medication
•Use of an illicit drug, such as cocaine
•Symptom of a medical illness (such as heart attack, heat stroke, hypoglycemia)
•Lack of oxygen in circumstances as diverse as high altitude sickness, emphysema, or pulmonary embolism (a blood clot in the vessels of the lung)
Source: https://www.webmd.com/anxiety-panic/guide/causes-anxiety