Anxiety: Anxiety can be best described as a syndrome that cause nervousness, fear, apprehension, and worrying. It affects the mental balance of a person and can cause physical symptoms. People suffering from anxiety may feel intense fear or phobia of a specific object or situation, such as heights or flying. People suffering from anxiety suffer from state of uneasiness, apprehension. Nausea and dizziness further complicate the issue. Chest pain, headaches and shortness of breath are other indicators of anxiety.