Pain is one of the most common reasons for medical consultations. We aren’t all equal when it comes to pain; responses to physical sensations and emotional impact caused by pain differ from one individual to another. However, all pains must be addressed as they are symptoms for diseases or trauma. Acute or chronic pain have a negative impact on the quality of life of a patient. While pain remains subjective, pain scales have been established to assess the impact of pain in the patient's life and track treatment efficacy over time. You will find these scales below.