Preventable suffering refers to the type of suffering that could have been prevented or alleviated through deliberate actions that are in accordance with moral and ethical considerations. It is a complex concept that has been debated by philosophers for centuries, and the definition varies depending on individual perspectives, cultural beliefs, and societal norms.

As for measuring suffering, it is a challenging task as it is subjective and based on individual experiences. However, some methods that have been used to approximate and evaluate suffering include self-report measures, physiological indicators, and behavioral observations. Self-report measures involve asking individuals to rate their level of suffering through verbal or written communication. Physiological indicators of suffering include changes in heart rate, blood pressure, and other physical responses to stress. Behavioral observations, such as changes in sleeping patterns, eating habits, or social behavior, can also be used to assess suffering. Additionally, medical and psychological scales, such as pain scales or depression scales, can provide a more quantifiable way of measuring the intensity and impact of suffering.

Even though those methods are not foolproof and may not accurately reflect the true nature and extent of an individual's suffering, we must do what we can to at least offer mutual aid and respect to our fellow being.