The DHI is a one of the most common and useful questionnaire for evaluating dizziness and unsteadiness that evaluate the effect of dizziness and unsteadiness and can be very helpful in vestibular rehabilitation. The DHI is translated to many languages such as Arabic, Brazilia, Chinese, Dutch, French, German, Italian, Norwegian, Portuguese, Spanish, and Swedish and show good psychometric properties such as validity, reliability and internal consistency in these translations. It is compatible with an international classification of functioning, disability and health that confirmed by WHO in 2001 for classifying the consequences of disease. It is easy to perform and interpret and takes 10 min. This questionnaire assesses the patient's condition and the effect of dizziness on the patient's quality of life. The DHI is a valid and reliable questionnaire that has high internal consistency. The DHI has 25 questions that classify the effects of dizziness in three categories of physical, functional and emotional. Considering the patients’ complaints, the dizziness handicap inventory (DHI) was developed by Jacobson and Newman in 1990. Specific self-perceived questionnaire has been designed for measurement of dizziness. Therefore psychometric tools such as questionnaires seem as an alternative method. These tests are not representing the dizziness effects on the patient's life or treatment progress. However, they are not representing the dizziness effects on patient's life or treatment progress, for example caloric test remains abnormal even after resolving the dizziness. There are some clinical tests utilizing in evaluation of dizzy patients. or fully perceive the effect of medication or rehabilitation on dizziness. However, it's hard to measure and quantify the dizziness effects. It was showed that quality of life is lower in patients with vestibular related dizziness than normal people. Dizziness is a common symptom that alters patient's abilities, job, habits, and functions even in remission.
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