Anemia is relatively common in all age groups and can affect anyone, although certain age groups may be at an increased risk. In young children, anemia is caused by iron deficiency and is usually easily treatable. In adults, anemia can be caused by iron deficiency, vitamin deficiencies, bleeding, chronic diseases, or inherited disorders. In older adults, anemia can be caused by chronic diseases such as cancer, blood disorders, or kidney or liver problems. Anemia can cause symptoms such as fatigue, shortness of breath, pale skin, and dizziness, so it is important to seek medical attention if you experience any of these symptoms.